Difference between revisions of "Helianthus pumilus"
Trans. Amer. Philos. Soc., n. s. 7: 366. 1841.
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | ||
Latest revision as of 20:12, 5 November 2020
Perennials, 30–100 cm (taproots slightly thickened). Stems erect, hispid or strigose. Leaves cauline; opposite; petioles 0.4–3 cm; blades (ashy green, usually 3-nerved from bases) lanceolate to ovate, 4–15 × 1–5 cm, bases ± cuneate to truncate, margins entire or serrate, faces strigoso-hispid, gland-dotted. Heads 1–6. Peduncles 0.5–5.5 cm. Involucres cylindric, 7–14 mm diam. Phyllaries 15–25 (loosely appressed), lanceolate to ovate, 3.5–7.5 × 2–3.5 mm, apices acute to acuminate, abaxial faces ± hispid or strigose (hairs whitish), gland-dotted. Paleae 7–8 mm, entire or ± 3-toothed (apices acute to acuminate, hispid). Ray florets 8–13; laminae 15–20 mm (abaxial faces gland-dotted). Disc florets 30+: corollas 5–6 mm, lobes yellow; anthers dark brown to black, appendages dark. Cypselae 3–4 mm, sparsely hairy; pappi of 2 aristate scales 4–4.5 mm plus 0–4 deltate scales 0.5–1 mm. 2n = 34.
Phenology: Flowering late summer.
Habitat: Dry, rocky soil in open areas
Elevation: 1200–2700 m
Discussion
Selected References
None.