Eastern Mojave Vegetation Coll. No. 1990, Helianthella quinquenervis  


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  Asteraceae Helianthella quinquenervis
Photographed 19 January 2019.

Coll. No. 1990, 23 Jul 2018, characters observed: Perennial herb, to 80 cm., rhizomatous; Stem, proximal glabrous to distal tangled multicellular hairy; Leaves, all cauline (some very proximally cauline), opposite, petiole, 35 mm., blade 110 mm. × 27 mm. wide, mid-cauline the largest, elliptic, entire, sparsely short hairy throughout, eglandular; Inflorescence, heads, 1 terminal, sometimes a smaller pair in upper axils, showy, >leaves, ±nodding; Peduncles (axillary), 70 mm.; Involucre, 15 mm. × 33 mm. wide, spheric; Phyllaries, 3± series, 28 mm. × 6 mm. wide, green flat, margin, ciliate; Receptacle, paleate; Palea, 11 mm. × 2.5 mm. wide, scarious, soft; Flowers, 2 kinds; Ray flowers, #20-24, tube 5 mm. + blade 23 mm. × 6 mm. wide, yellow, sterile; Disk flowers, many, tube 1.5 mm. + throat 3 mm. + lobes 0.5 mm., throat expanding abruptly, yellow; Pappus, disk flowers only, two types, 1.0 mm. scales in an outer ring, 2.5 mm. #2 awn-like scales; Cypsela, 7.4 mm. × 3 mm. wide, obovate, compressed side-to-side, black, hairy.

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Date and time this page was prepared: 6/16/2024 11:57:35 AM