Horkelia cuneata var. puberula
Rosaceae subfam. rosoideae
mesa horkelia, wedgeleaf horkelia
erect, 3–6 dm.
alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound;
stipules present, rarely absent.
5–12 per side, elliptic to obovate, 5–25 mm, distinctly pinnately veined.
open, most flowers arranged individually.
(2–)5–10 mm, proximalmost to 40 mm.
hypanthium interior rim usually glabrous, sometimes sparsely pilose;
petals oblanceolate to narrowly obovate, 2–4 mm wide;
filaments 1–2.5 × 0.5–2 mm.
torus usually enlarged, sometimes small or absent;
carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae);
ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula).
achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets;
styles persistent or deciduous, not elongate (elongate but not plumose in Geum).
= 7(8).
Horkelia cuneata var. puberula
Rosaceae subfam. rosoideae
Of conservation concern.
At its most distinctive, var. puberula is represented by historic collections from the hills and plains of Los Angeles, western Riverside, extreme southwestern San Bernardino, and northwestern San Diego counties; these populations have now largely been destroyed by urbanization. Scattered populations still exist within this core area, to what extent and with what level of ensured continuity remains uncertain. In addition, multiple populations of Horkelia cuneata from as far north and west as San Luis Obispo County have characteristics of var. puberula; these tend to intergrade with var. cuneata, as do some historic collections from the core area.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily.
Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora)
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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