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Helianthus gracilentus
A.Gray
Family:
Asteraceae
Slender Sunflower
FNA
Resources
Edward E. Schilling in Flora of North America (vol. 21)
Perennials
, 60-200 cm (taprooted).
Stems
(reddish or purplish) erect, hairy.
Leaves
cauline; all or mostly opposite; petioles 0-3 cm; blades (1- or 3-nerved) lanceolate to lance-ovate, 5-11 × 2-3.5 cm, bases cuneate, margins entire or serrate, abaxial faces hispid, gland-dotted.
Heads
1-5.
Peduncles
2.5-30 cm.
Involucres
hemispheric, 13-20 mm diam.
Phyllaries
20-25, lanceolate, 4-8 × 1.5-3 mm, (margins ciliate) apices acute, abaxial faces hispidulous, gland-dotted.
Paleae
8-9 mm, subentire to weakly 3-toothed (apices acute, ciliate, gland-dotted).
Ray florets
13-21; laminae 15-25 mm (abaxial faces gland-dotted).
Disc florets
50+; corollas 5-6 mm, lobes reddish; anthers reddish brown, appendages yellow or dull orange (style branches yellow
). Cypselae
3-4 mm, glabrate;
pappi
of 2 aristate scales 2.5-3 mm.
2
n
= 34.
Flowering late spring-fall. Dry slopes; 0-1800 m; Calif.; Mexico (Baja California).
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This project made possible by
National Science Foundation Award 1410069
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