Green Thread, Nueces Green Thread; Rio Grande Greenthread; Plains Greenthread

Thelesperma nuecense

Family: Asteraceae

Plant Description: Annual, usually 60-90 cm high, with leaves deeply divided into needlelike segments, opposite. Flower heads solitary, 3.5-5.5 cm wide. Disks purplish brown. Rays bright yellow with a brownish-red base.

Plant Trivia: Endemic to Texas.

Field Identification: Tall, single-flowered aster with no apparent leaves when viewed from a distance. Basal red spot on the petal distinguishes this from the other Thelosperma.

Occurrence: Frequent on deep coastal sands from ANWR to Baffin Bay.

Bloom Period: March -December

Plant Use: Pollinator source; bird seed.

Key to species of Thelesperma:

  1. Outer phyllaries 1.2-2 mm long, broad………………………………T. ambiguum

Outer phyllaries 3-7 mm long, narrow…………………………………………………….2

2. Rays solid yellow………………………………………………………………………..T. filifolium

Rays brownish red at base……………………………………………………...T. nuecense