Thelesperma species [Asteraceae]

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Scientific Name Thelesperma filifolium USDA PLANTS Symbol THFI
Common Name Greenthread ITIS Taxonomic Serial No. 38521
Family Asteraceae (Sunflower) SEINet
Reference
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Description Habitat: Dry areas, calcareous soils.
Plant: Upright annual (may be persistant) 6 to 24 inches tall with few to several branches.
Leaves: Divided one to three times into narrow segments up to 4 inches long, the upper ones becoming linear.
Inflorescence: Composite flowerheads 1 to 1-1/2 inches across, 8 yellow ray flowers, three-lobed, and many brown disk flowers; involucre is urn-shaped; 7 to 12 light green, pointed, narrow outer phyllaries and 8 greenish to reddish brown inner phyllaries.
Bloom Period: April to June.
References: "Wildflowers of the Texas Hill Country" by Marshall Enquist, SEINet, and "Manual of the Vascular Plants of Texas" by Correll and Johnston.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Thelesperma megapotamicum USDA PLANTS Symbol
THME
Common Name Hopi Tea Greenthread ITIS Taxonomic Serial No.
38525
Family Asteraceae (Sunflower) SEINet Reference
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Description Habitat: Sandy, disturbed soils, from 1000 to 9500 ft.
Plant: Erect perennial with several smooth, slender, branching stems 12 to 32 inches tall.
Leaves: Along lower half to three-quarters of the stem, opposite, compound once- or twice-pinnately-divided into thread-like segments 3/4 to 1-1/2 inches long.
Inflorence: Rayless flower heads about 1/2-inch long on long, smooth peduncles, each with many yellow and/or orange disk florets; phyllaries in two sets, inner ones longer, lanceolate and purple tinged, outer ones at the base of the involucre much shorter.
Bloom period: April to October.
References: "Wildflowers of Texas" by Geyata Ajilvsgi and SEINet.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Thelesperma simplicifolium USDA PLANTS Symbol
THSI
Common Name Edwards Plateau Greenthread, Navajo Tea ITIS Taxonomic Serial No.
38527
Family Asteraceae (Sunflower) SEINet Reference
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Description Habitat: Open, dry areas, calcareous soils.
Plant: Upright, weak, slender perennial 1 to 2-1/2 ft tall or more; one to several smooth stems.
Leaves: Few, sparse very thin linear stem leaves 1 to 3 inches long, three-parted or single; basal leaves may be pinnately-divided.
Inflorescence: Solitary to many composite flowerheads 3/4 to 1-1/4 inches across on peduncles 1 to 6 inches long; 8 yellow ray flowers, three-lobed, and many yellow disk flowers; involucre is hemispherically-shaped; 8 to 10 green outer, almost linear phyllaries, 8 brownish-green pointed inner phyllaries.
Bloom Period: May to November.
References: "Wildflowers of the Texas Hill Country" by Marshall Enquist, SEINet, and "Manual of the Vascular Plants of Texas" by Correll and Johnston.
BONAP Distribution Map

Texas Status:
Native

© Tom Lebsack 2019