Search Results

Information Annuals; proximal indument predominantly arachnoid, lanuginose, stipitate-glandular, or glabrescent, not farinose. Stems mostly 1–5(–12), usually erect to ascending; branches proximal and/or distal. Leaves: largest blades usually ± oblanceolate to elliptic or linear (± ovate in some C. macrantha), (0–)1–2-pinnately lobed, not gland-dotted (except C. macrantha). Heads discoid or ± radiant. Peduncles erect to ascending (by flowering). Phyllaries: outer usually ± blunt, sometimes acute. Florets: corollas white to pinkish, cream, or bright to dark yellow, actinomorphic and ± equal, or peripheral enlarged (and often zygomorphic). Cypselae ± terete (except C. nevii); pappi 0, coroniform (of ± 10 scales), or of (1–)4–8(–14) scales in 1 series, in 2, abruptly unequal series, or in 2–3, gradually unequal series. x = 6.

Information Annuals, biennials, perennials, or subshrubs, (2–)5–70(–200) cm (taprooted). Stems erect to prostrate, usually branched. Leaves basal and/or cauline (smaller and sparser distally except in C. cusickii); alternate; usually petiolate; blades deltate, elliptic, linear, oblanceolate, or ovate (plane or ± 3-dimensional), (0–)1–4-pinnately (rarely -subpalmately) lobed, ultimate margins entire, faces glabrous or hairy, often stipitate-glandular or gland-dotted. Heads discoid or ± radiant, borne singly or in (terminal) ± cymiform arrays (erect in bud except C. macrantha). Involucres hemispheric to obconic or broadly cylindric, (3–)5–15[–25] mm diam. Phyllaries 5–21+ in 1–2(–3) series (subequal to unequal). Receptacles convex to ± flat, pitted and/or knobby, usually epaleate (paleae 3–10+ in C. carphoclinia). Ray florets 0 (sometimes simulated by enlarged peripheral disc corollas). Disc florets 8–70+, bisexual, fertile (diurnal with anthers exserted except in C. macrantha); corollas white, pinkish, cream, or yellow, tubes shorter than cylindric or funnelform throats, lobes 5, deltate to ± lanceolate (sometimes enlarged, unequal; style-branch appendages blunt, obscure). Cypselae clavate to ± cylindric or compressed, obscurely 8–20-angled, faces scabrous and strigose to densely sericeous (usually eglandular); pappi usually persistent, of (1–)4–20, distinct, ± erose scales in 1–4 series (equal or unequal, outer then shorter, scales usually fewer and/or shorter on peripheral cypselae, midnerves obscure), sometimes 0 or coroniform. x = ? (n = 6, 8, plus polyploids and dysploid numbers).

Information Plants 5–25(–35) cm; proximal indument grayish, arachnoid-sericeous to closely lanuginose (sometimes tardily glabrescent). Stems mostly 1–5; branches mainly proximal. Leaves basal (withering) and cauline, 1.5–7 cm; largest blades ± elliptic to ovate, ± plane, not succulent, 1(–2)-pinnately lobed (± gland-dotted beneath indument); primary lobes mostly 2–5 pairs, ± remote, ultimate lobes ± plane. Heads (± radiant, nocturnally), mostly 1–5(–7) per stem (nodding in bud). Peduncles 1.5–8 cm, arachnoid-sericeous to thinly lanuginose distally, not stipitate-glandular. Involucres ± obconic to broadly cylindric. Phyllaries: longest 12–18 mm; outer arachnoid-sericeous to thinly lanuginose in fruit, not stipitate-glandular, apices ± squarrose, blunt, pliant. Florets: corollas (nocturnal) white to pinkish or cream, 9–12(–15) mm (lengths 1.8–2.2 times cypselae; anthers ± included); peripheral corollas nocturnally spreading, actinomorphic, scarcely enlarged. Cypselae 5–6(–7) mm; pappi of 8 scales in 2, abruptly unequal series, longest scales 5–7 mm. 2n = 12.