Taxon	Illustrator ⠉
	Chamaebatia foliolosa Lyonothamnus floribundus Physocarpus opulifolius	Marjorie C. Leggitt Marjorie C. Leggitt Marjorie C. Leggitt

Plants clonal, 50–100 (–150) dm, herbage usually glabrous, glabrate, or tomentulose (glabrescent). Stems 1+; bark brown or gray; short-shoots absent. Leaves tardily falling, cauline; stipules absent or lance-linear, margins entire; petiole present; blade simple (sometimes lobed), palmate, or pinnate, simple blades or leaflets elliptic, lance-linear, lanceolate, or oblong, 6–18 cm, leathery, leaflets 3–7, usually pinnately lobed, margins ± revolute, entire, crenulate, or serrate. Inflorescences terminal, 50–800+-flowered, compound-corymbs or panicles; bracts present; bracteoles present. Pedicels present. Flowers produced after leaves, (5–) 6–8 mm diam.; hypanthium 3–4 (–5) mm (including sepals), exterior tomentulose, interior pilose; sepals 5, spreading, ovate to triangular; petals 5, white, obovate to orbiculate; stamens (12–) 15+ in 1 series, shorter or longer than petals; carpels tomentulose. Fruits aggregated follicles, 2 (–3), ± ovoid to lanceoloid, 3–4 mm (excluding styles), stipitate-glandular, dehiscent adaxially; hypanthium persistent; sepals persistent or tardily falling, ± spreading. Seeds 2–4+, ± ellipsoid to fusiform, firm, ends rounded or truncate, faces smooth or minutely papillate, seed-coats tight. x = 9.

Distribution

Calif. (Channel Islands)

Discussion

Species 1.

Taxonomically, Lyonothamnus has been moved about within Rosaceae; here it is placed as an isolated taxon within Amygdaloideae. It is known from Miocene fossils from California, Nevada, and Oregon (D. M. Erwin and H. E. Shorn 2000).

Selected References

None.

Lower Taxa

Lyonothamnus floribundus

"thin" is not a number."dm" is not declared as a valid unit of measurement for this property.