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Your search found 65 taxa.
Black of anthers & white of petals give plant a "pepper & salt" appearance, per www.missouriplants.com
Flowers sessile or subsessile. Petals white or rose-tinged, per Flora of China.
Petals yellowish green, much longer than the calyx, per Weakley's Flora.
Umbellets with 4-6 flowers: 3 perfect, 1-3 staminate, per Weakley's Flora.
Umbellets with 7-9 flowers: 3 perfect & 4-6 staminate, per Weakley's Flora.
Flower heads pale to dark blue, cylindric, solitary from leaf axils, per Vascular Flora of the Carolinas.
Tiny flowers in spherical heads almost 1" across, in wide-branching umbels, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Heads subglobose, 1-3cm long, 1-2.5cm broad. Petals bright blue [when mature], per Vascular Flora of the Carolinas.
Flowers bluish in .25" roundish heads, per Wildflowers of the Southern Mountains.
Heads subglobose to hemispherical, 6-12mm in diameter, per Weakley's Flora.
Heads globose, 9-15mm diam. The styles exceed bractlets subtending each flower, per Weakley's Flora.
Heads subglobose or hemispherical when fully developed, about as wide as long, per Weakley's Flora.
The central flower of each umbel is maroon, per Vascular Flora of the Carolinas.
The central flower of the umbel is white, per Weakley's Flora.
Small white flowers in compound umbels on 1-8" peduncles, w 5-9 umbellets, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Umbels compound with hairy stalks. Flower petals longer than the styles, per Wildflowers of Tennessee.
Similar to O. claytonii, but anise-scented & styles much longer than petals, per Wildflowers of Tennessee.
3-7 flowers per umbellet; petals white, per Vascular Flora of the Carolinas.
Each 0.5-1" umbel bears 3-10 tiny white flowers, per Atlantic Coastal Plain Wildflowers.
Inferior ovary. Pedicels of fertile flowers ~ 1mm long, per Vascular Flora of the Carolinas.
The umbel is open, its slender primary rays up to 3" long and unequal, per Wildflowers of the Southern Mountains.
In Zizia each umbellet's central flower is sessile; vs. Thaspium all stalked, per Wildflowers of the Southern Mountains.
Pollinator at work. The central flower of each umbellet sessile or subsessile, per Vascular Flora of the Carolinas.
All flowers with distinct pedicels. Petals maroon or dark purple, per Vascular Flora of the Carolinas.
Compound umbel with 4-10(-11) rays; central flower of each umbellet pedicelled, per Weakley's Flora.
In Thaspium, all flowers are stalked, per Wildflowers of the Southern Mountains.
Compound umbels with 8+ spreading rays. All flowers pedicellate. Petals white, per Vascular Flora of the Carolinas.
Small yellow flowers with conspicuous ovate bractlets about 3/8" long, per Wildflowers of the Southern Mountains.
Umbels leaf-opposed (not terminal and not axillary), per Weakley's Flora.
Small flowers in loose, irregular, compound umbels, a few in each umbellet, per Wildflowers of Tennessee.
Flowers are tiny and arranged in flat-topped clusters 2-4" across, per Plant Invaders of Mid-Atlantic Natural Areas.
Tiny white flowers in umbels 1.5-2.5" wide, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Umbels often doubly compound, per Wildflowers of Tennessee.
Tiny white flowers borne in compound umbels 2-5" wide, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
May resemble robust P. ahlesii or P. capillaceum, but can be larger & coarser, per Weakley's Flora.
Samll white flowers in a compound umbel, the umbel bracts usually 3-parted, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
The umbels are compound, with 16-25 spreading rays 2-5cm long, per Vascular Flora of the Carolinas.
Umbels w 13-25 rays Nectar apparently intoxicating to yellow jackets & hornets, per Weakley's Flora.
Umbels composed of 12-25 rays, the longest 3-5cm long, per Vascular Flora of the Carolinas.
Umbels composed of 5-11 rays, mostly 2-8cm long, per Vascular Flora of the Carolinas.
Each flat-topped flower cluster contains 10-20 smaller clusters, per Field Guide to the Rare Plants of Georgia.
Flowers in flat-topped clusters containing 7-12 smaller flat-topped clusters, per Field Guide to the Rare Plants of Georgia.
Umbels compound, terminal and lateral, rays 12-25, spreading-ascending, per Vascular Flora of the Carolinas.
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