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Mitchell's Sedge,
Carex mitchelliana
Pistillate spike of C. mitchelliana (L) and C. crinita (R).
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Mitchell's Sedge,
Carex mitchelliana
Staminate spikes of C. mitchelliana (L) and C. crinita (R) are subtly different. — Eric Ungberg
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Frank's Sedge,
Carex frankii
Along the stem are 3-7 dense, greenish, cylindric, pistillate spikes , per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Sallow Sedge,
Carex lurida
Pistillate spikes oblong, 2.5-5.5cm long, 14-20mm broad, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Sallow Sedge,
Carex lurida
Staminate spike 3-8cm long, 2mm broad. Pistillate spikes 2-3, oblong, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Bladder Sedge,
Carex intumescens var. intumescens
Perigynia lanceoloid to ovoid, convex to the base, 1-12 (-20) per spike, per Weakley's Flora.
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Longstalk Sedge,
Carex pedunculata var. pedunculata
The lower spikes are female and occur at the ends of long, arching stalks up to 13cm long, per Vascular Plants of North Carolina.
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Shortleaf Yellow-eyed-grass,
Xyris brevifolia
Spike subglobose, 4-6mm long or broad, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Chapman's Yellow-eyed-grass,
Xyris chapmanii
Scape usually > 50cm long, spike vertical, per Weakley's Flora (2015).
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Florida Yellow-eyed-grass,
Xyris floridana
Mature spikes ovoid, sharply acute. Plants solitary or in small clumps, per Weakley's Flora.
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Richard's Yellow-eyed-grass,
Xyris jupicai
Spike ellipsoid to ellipsoid-cylindrical, 8-15(25)mm long, 6-10mm broad, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Woolly Frogsmouth,
Philydrum lanuginosum
Multiple yellow flowers borne on a simple (sometimes few-branched) spike, per Weed Risk Assessment for Philydrum lanuginosum (Philydraceae) - Woolly frogs mouth.
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Heartleaf Pickerelweed,
Pontederia cordata var. cordata
Inflorescence a dense terminal spike-like panicle, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Lanceleaf Pickerelweed,
Pontederia cordata var. lancifolia
Each plant produces a 5" spike of violet-blue flowers, per Wildflowers of the Southern Mountains (Smith, 1998).
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Fairywand,
Chamaelirium luteum
Female spike erect and less than 2" long when flowering begins, but lengthens, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Fairywand,
Chamaelirium luteum
Pistillate (female) spike.
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Fairywand,
Chamaelirium luteum
Pistillate flowers in racemes [with pedicels] or spikes [without pedicels], per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Sticky Bog Asphodel,
Triantha glutinosa
Inflorescences cylindric-ovate spikelike heads, the stem glandular below them, per Flora of North America.
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Northern White Colicroot,
Aletris farinosa
Whitish flowers in a stiff, spikelike raceme 4-12" long, per Newcomb's Wildflower Guide (Newcomb, 1977).
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Large Death Camas,
Zigadenus glaberrimus
Flowers grow in a spikelike terminal inflorescence and on ascending branches, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Cinnamon Vine,
Dioscorea polystachya
Male spikes bearing flowers singly, flowers bracteate, internodes < 2 mm, per Flora of North America.
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Cinnamon Vine,
Dioscorea polystachya
Rachis of male spikes obviously zigzagged; flowers sessile, per Flora of China.
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Common Wild Yam,
Dioscorea villosa
Staminate spikes have up to 4 flowers per node, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Common Wild Yam,
Dioscorea villosa
Female (pistillate) spikes have 1 flower per node, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Air Yam,
Dioscorea bulbifera
Flowers rarely, with fragrant spikes to 4" long hanging from leaf axils, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).
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Southern Rein Orchid,
Platanthera flava var. flava
A loose terminal spike of 10-40 yellowish-green flowers, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Fishmint,
Houttuynia cordata
4 white petal-like bracts subtend flowers composed of a dense short spike of stamens & ovaries, per Vascular Plants of North Carolina.
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Pepper-elder,
Peperomia pellucida
Spikes can be axillary, terminal, or opposite leaves; solitary (rarely 2+), per Flora of North America.
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Australian-pine,
Casuarina equisetifolia ssp. equisetifolia
Male flowers are borne in slender cylindrical spikes at the twig tips, per www.wiki.bugwood.org.
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Tag Alder,
Alnus serrulata
Pistillate flowers borne in erect, short, ovoid, cone-like spikes, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
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Southern Red Oak,
Quercus falcata
Pistillate flowers with 3-lobed stigmas, solitary or in few-flowered spikes, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
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Blackjack Oak,
Quercus marilandica var. marilandica
Pistillate flowers with 3-lobed stigmas, solitary or in few-flowered spikes, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
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Water Oak,
Quercus nigra
Pistillate flowers solitary or 2-3 on a short spike, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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False Nettle,
Boehmeria cylindrica
Tiny flowers in small headlike clusters arranged along spikes in leaf axils, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Buffalo-nut,
Pyrularia pubera
Inflorescence an erect terminal spike with greenish apetalous flowers, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011).
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Virginia Jumpseed,
Persicaria virginiana
Flowers strung out along a slender terminal spike up to 18" long, per Wildflowers of the Southern Mountains (Smith, 1998).
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Longbristle Smartweed,
Persicaria longiseta
Deep reddish-pink flowers on erect terminal spikes only 0.2" wide, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Spotted Lady's-thumb,
Persicaria maculosa
Spikes of flowers upright, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).
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Mild Waterpepper,
Persicaria hydropiperoides
Flowers without dotted glands, in erect spikes with gaps between clusters, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Mexican-tea,
Dysphania ambrosioides
Inflorescence of paniculate spikes of cymules, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Lambsquarters,
Chenopodium album var. album
Minute greenish flowers in dense paniculate spikes or cymes, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Spiny Amaranth,
Amaranthus spinosus
Simple or compound terminal staminate spikes, usually green to silvery green, per Flora of North America.
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Florida Cottonseed,
Froelichia floridana var. floridana
Fruiting spike 10-12mm in diameter. Fresh fruiting spikes appearing white, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Slender Cottonweed,
Froelichia gracilis
Fruiting spike 7-8mm in diameter. Fresh fruiting spikes appearing gray, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Coastal Witch-alder,
Fothergilla gardenii
The terminal spikes are delicately scented with a sweet honey fragrance, per Gardening with the Native Plants of Tennessee (Hunter, 2002).
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Coastal Witch-alder,
Fothergilla gardenii
1-2" spikes of white stamens & yellow anthers form little bottlebrushes, per Gardening with the Native Plants of Tennessee (Hunter, 2002).
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Canada Burnet,
Sanguisorba canadensis
Flowers are borne in cylindric spikes, 2-6" long, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Yellow Sweetclover,
Melilotus officinalis
Inflorescence a slender, axillary, pedunculate, spike-like raceme, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Georgia Indigo-bush,
Amorpha georgiana
Shrub to 1m tall, usually multistemmed, glabrate. Spikes to 6cm long, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Mountain Indigo-bush,
Amorpha glabra
Sometimes there are terminal, spikelike remnants of the fruit-bearing stems in winter, per Woody Plants of the Southeastern US: A Winter Guide (Lance, 2004).
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Pink-tassels,
Dalea carnea
Flowers borne in compact tassel-like spikes 0.5-1.625" long, on branch tips, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Viperina,
Zornia bracteata
Flowers pea-shaped, borne in spikes, the petals deep yellow, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Japanese-clover,
Kummerowia striata
Flowers solitary or 2-5 in spikelike axillary racemes, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Narrow-leaved Lespedeza,
Lespedeza angustifolia
Flowers whitish with a purplish base, borne in dense long-stalked spikes, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Seneca Snakeroot,
Polygala senega +
Flowers in a spike-like terminal raceme, white tinged w pink or green, < 1/4" long, often closed, per Wildflowers of the Atlantic Southeast (Cotterman, Waitt, & Weakley, 2019).
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Pineland Threeseed Mercury,
Acalypha ostryifolia
Pistillate flowers chiefly in terminal spikes, staminate in axillary clusters, per Weakley's Flora.
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Pineland Threeseed Mercury,
Acalypha ostryifolia
Pistillate spikes 3-11cm long, bracts deeply cleft into 9-17 linear teeth, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Nettleleaf Noseburn,
Tragia urticifolia
Spikes with 1-2 female flowers at base, 11-40 male flowers above, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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Queen's-delight,
Stillingia sylvatica
Male flowers in a terminal spike, female flowers few and at its base, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Queen's-delight,
Stillingia sylvatica
Fruit a woody capsule (the male-flower portion of the spike is deciduous), per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).