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FNA | Family List | FNA Vol. 9 | Rosaceae | Cercocarpus

1b. Cercocarpus betuloides Nuttall var. blancheae (C. K. Schneider) Little, Phytologia. 4: 308. 1953.

Coastal mountain mahogany

Cercocarpus betulifolius Nuttall ex Hooker var. blancheae C. K. Schneider, Mitt. Deutsch. Dendrol. Ges. 14: 127. 1905 (as belulaefolius); C. alnifolius Rydberg; C. betuloides subsp. blancheae (C. K. Schneider) Thorne; C. betuloides var. multiflorus Jepson; C. montanus Rafinesque var. blancheae (C. K. Schneider) F. L. Martin

Shrubs or trees, 10–50(–80) dm. Young stems with tightly coiled hairs. Leaves: stipules (3–)4–6(–10) mm; blade oblong-obovate or -elliptic, obovate, ovate, or suborbiculate, (8–)12–50(–78) × (4–)8–35(–64) mm, subcoriaceous to coriaceous, margins serrate or dentate or crenate in distal 1/5–3/4, abaxial veins with coiled, 1/2 coiled, or coiled-wavy hairs to 1 mm (or some appressed-sericeous hairs on off-coastal island plants), areoles canescent or glabrous, adaxial surface sparsely similarly hairy, glabrescent. Flowers (1–)3–8(–18) per short shoot; hypanthial tubes with coiled hairs (or some sericeous hairs on island plants). Achenes 8–11(–13) × 1.8–2.5(–2.9) mm; fruiting pedicels (1.5–)3–11(–14) mm; hypanthial tubes (6–)7–13(–16) mm; pedicel/tube ratio (20–)35–90(–120)%; fruit awns 5.3–7.5(–9.2) cm.

Flowering late Feb–Apr. Coastal chaparral; (10–)100–800 m; Calif.; Mexico (Baja California).

Variety blancheae grows primarily in chaparral in coastal southern California from San Luis Obispo to San Diego counties (rare in northern Baja California, Mexico) and on adjacent Santa Catalina, Santa Cruz (where frequent), and Santa Rosa (rare) islands. This treatment combines the coastal mainland and insular plants. Both tend to have multiple flowers on each short shoot and coiled hairs on young stems, leaves, hypanthia, and pedicels. This coiled hair type is consistent in mainland populations; some insular plants are sericeous throughout. Insular plants typically have larger leaves than mainland plants, except in very dry areas, and conversely, mainland coastal plants previously designated as var. betuloides have smaller leaves except in protected and shaded habitats. Recognition of these two as distinct, at any rank, is poorly supported, and the authors consider them phases of a single taxon. Plants of the more arid slopes in transmontane southern and central California are more sericeous throughout and have fewer flowers per short shoot (see var. betuloides). Intermediates occur in zones of contact.


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