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Plateilema
Plateilema
Family:
Asteraceae
Flora of North America
Resources
John L. Strother in Flora of North America (vol. 21)
Perennials
, mostly 5-8+ cm.
Stems
erect, branched mostly from bases.
Leaves
mostly basal; alternate; obscurely petiolate; blades obovate to oblanceolate, pinnately toothed or lobed (lobes deltate to obovate), ultimate margins toothed or entire, faces sparsely hispid (hairs white, coarse) or glabrate, not gland-dotted.
Heads
radiate, borne singly.
Involucres
broadly turbinate, mostly 7-9 mm diam.
Phyllaries
persistent, 8-12 in 2 series (spreading or erect in fruit, basally connate, gray-green, ± ovate, sparsely hispid).
Receptacles
convex, ± pitted, epaleate.
Ray florets
8-12, pistillate, fertile; corollas yellowish with 4-5+ purplish nerves (apices 3-4-lobed).
Disc florets
40-60+, bisexual, fertile; corollas yellowish to purplish, tubes much shorter than ampliate, cylindric throats, lobes 5, ± deltate (± equal, usually hispidulous and/or glandular-puberulent).
Cypselae
obpyramidal, ± 4-5-angled (lengths 1.5-3 times widths), ± hispid on angles;
pappi
persistent, of 4-5 brownish, moderately lacerate to erose or truncate scales.
Species within inventory project:
Arizona Flora
Plateilema palmeri