Eastern Mojave Vegetation Coll. No. 1988, Erigeron subtrinervis  


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  Asteraceae Erigeron subtrivervis
Photographed 16 January 2019.

Coll. No. 1988, 23 July 2018, characters observed: Perennial herb, 35-40 cm., rhizomatous; Stem, spreading hairy, thinning on older stem, without decurrent lines from leaf bases; Leaves, basal withered, cauline, alternate, petiole, proximal 28 mm., to absent mid- to distal-cauline, blade, 40 mm. × 7 mm. wide, 5.7× long as wide, reduced distally, lanceolate, entire, tips white spinulose only in the most distal leaves; Inflorescence, heads #4-8 per stem, showy, (nearly) flat-topped, >leaves; Peduncles, 25-50 mm.; Involucre, 7 mm. × 14 mm. wide, hemispheric; Phyllaries, 3+ series, ±equal, 7 mm. × 0.7 mm. wide, green, with a purplish tip, margins, flat, scarious, tips, sinuous, acute; Flowers, of 2 kinds; Ray flowers, ±#100 (more than usually described), tube 3 mm. + blade 11 mm. × 1.4 mm. wide, blue, fertile (assumed, at least small stigmas seen); Disk flowers, many, tube 4 mm. + lobes 0.5 mm., yellow; Pappus, 2 series, on both ray and disk flowers, 0.5 mm. and 3.0 mm., bristles, barbellate; Cypsela, 2 mm. × 0.8 mm. wide, compressed front to back, brown.

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Date and time this page was prepared: 6/16/2024 11:57:34 AM