Lyonothamnus

A. Gray

Proc. Amer. Acad. Arts 20: 291. 1885.

Common names: Catalina or island ironwood
Conservation concernEndemic
Etymology: For William Scrugham Lyon, 1851 – 1916 botanist, nurseryman, plant collector in California and Philippines, and Greek thamnos, bush or shrub
Treatment appears in FNA Volume 9. Treatment on page 346. Mentioned on page 345.
Revision as of 23:12, 16 December 2019 by FNA>Volume Importer

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).

... more about "Lyonothamnus"
John L. Strother +
A. Gray +
Catalina or island ironwood +
Calif. (Channel Islands). +
For William Scrugham Lyon, 1851 – 1916 botanist, nurseryman, plant collector in California and Philippines, and Greek thamnos, bush or shrub +
Proc. Amer. Acad. Arts +
brandegee1890a +, bushakra1999a +  and erwin2000a +
Conservation concern +  and Endemic +
Lyonothamnus +
Rosaceae tribe Lyonothamneae +