Malacothrix incana
dune malacothrix, dunedelion
1, branched proximally and distally, usually tomentose, sometimes glabrous.
proximal obovate to narrowly spatulate, sometimes pinnately lobed (lobes 1–2+ pairs, subequal, apices obtuse), sometimes ± fleshy, margins usually obtuse-lobed, sometimes entire;
distal not notably reduced (similar to others).
10–14 × 4–8+ mm.
not bristly.
47–99;
corollas medium yellow, 11–20 mm;
outer ligules exserted 5–10 mm.
16–30 in 2–3 series, (red-tinged) lanceolate or oblong to linear, hyaline margins 0.05–0.1 mm wide, faces glabrous.
of 5–16+, ovate to lanceolate bractlets, hyaline margins 0.05–0.2 mm.
usually cylindro-fusiform, sometimes weakly prismatic, 1.5–2.2 mm, ribs extending to apices, ± equal;
persistent pappi 0.
70–100% 3-porate.
= 14.
Malacothrix incana
Malacothrix incana, a dune endemic, grows currently on the coastal mainland in Santa Barbara and San Luis Obispo counties, and on San Miguel, San Nicolas, Santa Cruz, and Santa Rosa islands. Its nomenclatural type specimen was collected at San Diego, probably from the Silver Strand dune areas on Coronado Island.
Populations of a glabrous form, var. succulenta, occur in Santa Barbara County (e.g., Casmalia Beach) and San Luis Obispo County (e.g., west of Oso Flaco Lake). Glabrous forms and tomentose forms grow together on San Miguel and San Nicolas islands.
Extensive hybridization between Malacothrix incana and M. foliosa subsp. polycephala occurs on San Nicolas Island where dunes have extended into areas of normal soil, particularly along the western and southwestern portions of the island.
Hybridization between Malacothrix incana and M. saxatilis var. implicata occurs on San Miguel Island on east-facing slopes above Cuyler Harbor.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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