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FNA | Family List | FNA Vol. 21 | Asteraceae | Chaenactis

15d. Chaenactis glabriuscula de Candolle var. glabriuscula

Chaenactis glabriuscula var. curta (A. Gray) Jepson; C. glabriuscula var. tenuifolia (Nuttall) H. M. Hall; C. tenuifolia Nuttall

Plants 10–60 cm; proximal indument grayish, ± arachnoid. Stems mostly 1–5, ascending to erect; branches proximal and, often, distal. Leaves basal (withering) and cauline, 3–8 cm; largest blades ± plane to 3-dimensional, scarcely succulent, 1(–2)-pinnately lobed; primary lobes 2–7 pairs, remote to ± congested, ultimate lobes plane, twisted, involute, or terete. Heads 2–20+ per stem. Peduncles 1–4(–10) cm. Involucres ± hemispheric to obconic. Phyllaries: longest 5–7 × 1–2 mm; outer (at least medially) ± arachnoid-sericeous and, often, ± stipitate-glandular in fruit. Florets: inner corollas 4–6 mm. Cypselae 3–5.5 mm; pappi of (1–)4 scales in 1 series, longest scales mostly 2–4 mm, lengths 0.4–0.7 times corollas. 2n = 12.

Flowering Feb–Jun. Dry slopes, sandy places, openings in chaparral, woodlands; 100–2300 m; Calif.; Mexico (Baja California).

Variety glabriuscula is known mainly in and west of the Peninsular Ranges and adjacent desert edges, inland from the coast; it also extends to Santa Rosa Island. Northward it intergrades with vars. megacephala and lanosa; near the coast it intergrades with var. orcuttiana. Forms sometimes recognized as var. tenuifolia are distinctive in the filiform leaf segments but merge seamlessly with the remainder of var. glabriuscula.


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