GREENTHREAD
File Size: 66 KB
 
Thelesperma filifolium   (Hook. ) A. Gray
Tallgrass Prairie National Preserve,
Annual or short-lived perennial
Height: 1-3 feet
Family: Asteraceae - Sunflower Family
Flowering Period:   June, July, August, September
Also Called: Fine-leaf thelesperma, thread-leaf thelesperma.
Stems: Erect, 1 to several, simple or branched from base.
Leaves: Numerous, opposite, 2 to 4.5 inches long, 1-3 times pinnately divided; segments linear to filiform, 1/3 to 1 inch long, very narrow, thread-like; upper leaves reduced, not as deeply divided.
Inflorescences: Heads, several to numerous, terminal, on long stalks, urn-shaped, 1 to 1.5 inch wide.
Flowers: Bracts of 2 sizes; outer bracts 7-12, narrowly linear, 1/2 as long as inner; inner bracts 8, lanceolate, united to form a cup; tips reddish; ray florets 8, 1/3 to 1 inch long, golden yellow; bases sometimes reddish-tinged; tips 3-lobed; disk florets numerous, corollas reddish brown.
Fruits: Achenes, straight or slightly curved, less than 1/4 inch long, tipped with 2 short, barbed awns, enclosing small seed.
Habitat: Dry prairies, roadsides, and disturbed sites, in sandy or gravelly soils.
Distribution: Southeast 1/4 and southwest corner of Kansas.
Comments: The buds droop prior to flowering and become erect when open.

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