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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Malacothrix

7. Malacothrix glabrata (A. Gray ex D. C. Eaton) A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 422. 1884.

Smooth desertdandelion

Malacothrix californica de Candolle var. glabrata A. Gray ex D. C. Eaton in S. Watson, Botany (Fortieth Parallel), 201. 1871

Annuals, (5–)10–40+ cm. Stems (1–)3–5+, ascending to erect, usually branched proximally and distally, glabrous or sparsely arachno-puberulent near bases (sometimes glaucous). Cauline leaves: proximal usually pinnately lobed (lobes 3–6+ pairs, usually filiform, subequal to unequal, apices acute), ultimate margins entire, faces glabrous or ± hairy (then usually glabrescent); distal reduced (usually pinnately lobed). Calyculi of 12–20+, lanceolate to linear bractlets, hyaline margins 0.05–0.2 mm wide (abaxial faces often ± densely white-hairy). Involucres campanulate to hemispheric, 9–17 × 4–7 mm. Phyllaries 20–25+ in 2–3 series, lance-linear to linear, hyaline margins 0.05–0.3 mm wide, faces usually glabrous, abaxial sometimes ± white-hairy. Receptacles bristly. Florets 31–139; corollas usually pale yellow, sometimes white, 15–23+ mm; outer ligules exserted 9–15+ mm. Cypselae ± cylindro-fusiform (sometimes weakly 5-angled), 2–3.3 mm, ribs extending to apices, usually ± equal; persistent pappi of 0–12+, blunt to acute teeth plus 1–2(–5) bristles. Pollen 70–100% 3-porate. 2n = 14.

Flowering Mar–Jul. Coarse soils in open areas, or among shrubs, creosote bush scrublands, Amsinckia, Artemisia, and Atriplex-Larrea associations, Joshua tree woodlands; 0–1800 m; Ariz., Calif., Idaho, Nev., N.Mex., Oreg., Utah; Mexico (Baja California, Sonora).

Malacothrix glabrata grows in the Mojave, Great Basin, and Sonoran deserts in California and the Intermountain region in Arizona, Nevada, Oregon, and Utah.


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