Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
Common Yellow Thistle, Purple Thistle
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Roxanna Martin rlm22109_006
February Spartanburg County SC
This upright biennial first appears as a densely spiny-leafed rosette, per Forest Plants of the Southeast and Their Wildlife Uses.
JK Marlow jkm160426_134
April Greenville County SC
Leaves villous above, grayish arachnoid beneath, dissected, not decurrent, per Vascular Flora of the Carolinas.
Keith Bradley kab_c_horridulum_02112
April Miami-Dade County FL
Outer and middle phyllaries appressed-ascending, margins setulose-ciliolate, per Flora of North America.
Keith Bradley kab_c_horridulum_3416
April Richland County SC
Heads 1-10, rarely more, racemose, per Vascular Flora of the Carolinas.
Richard and Teresa Ware rtw_c_horridulum_horridul
Leaves spiny on the margin, pinnately lobed, stalkless, clasping stem, per Guide to the Wildflowers of SC.
John B. Nelson jbn_486408361_e5788d3461
May Beaufort-Hampton Counties SC
The yellow-flowered form is restricted to the Coastal Plain, per Guide to the Wildflowers of SC.
JK Marlow jkm140521_115
May Greenville County SC
Swamp Rabbit Trail
The bristles (technically "pappus") on seeds expand into fluffy thistledown, per Atlantic Coastal Plain Wildflowers.
Roxanna Martin rlm5509_064
May Spartanburg County SC
Flower heads more or less enclosed by an outer whorl of spiny leaf-like bracts, per Vascular Flora of the Carolinas.
COMPARE involucral bracts of Thistles
Richard and Teresa Ware rtw_cirsium_horridulum
Yellow Thistle is a robust plant w large purple heads frequently > 2" across, per Wildflowers of the Southern Mountains.
Richard and Teresa Ware rtw_cirsium_horridulum_5
Yellow-flowered plants are found only in the coastal plain, per Wildflowers of the Southern Mountains.