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Thelesperma

Thelesperma
Family: Asteraceae
Thelesperma image
Cecelia Alexander
  • FNA
  • Resources
John L. Strother in Flora of North America (vol. 21)
Annuals, perennials, or subshrubs, 10-70+ cm. Stems usually 1, erect, branched distally or ± throughout. Leaves mostly basal, basal and cauline, or mostly cauline; mostly opposite (distal rarely alternate); blades usually 1(-3)-pinnately lobed (ultimate lobes oblanceolate to filiform), faces usually glabrous, rarely hairy. Heads radiate or discoid, borne singly or in loose, corymbiform arrays. Calyculi of 3-8+ distinct, usually spreading or reflexed, usually linear to subulate, herbaceous bractlets. Involucres hemispheric to urceolate, 4-15+ mm diam. Phyllaries 5-8 in ± 2 series, persistent, connate 1/5-7/8+ their lengths, lance-ovate to ovate, ± equal, ± leathery to membranous, margins (of distinct apices) scarious. Receptacles flat to convex, paleate; paleae falling, (whitish with red-brown striae, each ± appressed to abaxial face of subtended cypsela), obovate to oblong, scarious. Ray florets 0 or ca. 8, neuter; corollas yellow or red-brown, or bicolored (yellow and red-brown). Disc florets 20-100+, bisexual, fertile; corollas yellow (with red-brown nerves) or red-brown, either with throats equal to or longer than 5, ± deltate, ± equal lobes, or with throats shorter than 5, ± lance-linear, ± unequal lobes (in either form, the abaxial sinus usually ± deeper than others). Cypselae (dark red-brown or stramineous) outer often arcuate, shorter, inner more columnar, usually some or all ± obcompressed (each usually shed together with its subtending palea), faces smooth or papillate to tuberculate or verrucate, margins sometimes ± winged; pappi 0, or persistent, of 2 retrorsely ciliate, subulate scales or awns. x = 12.
Species within inventory project: Arizona Flora
Thelesperma longipes
Media resource of Thelesperma longipes
Map not
Available
Thelesperma megapotamicum
Media resource of Thelesperma megapotamicum
Map not
Available
Thelesperma subnudum
Media resource of Thelesperma subnudum
Map not
Available
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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