Oenothera macrocarpa subsp. incana
Onagraceae subfam. onagroideae
several, unbranched, sometimes with shorter secondary branches, 1–20(–30) cm.
usually gray, rarely green, (5–)6.2–12.5(–17) ×2–4.3 cm;
blade usually very broadly elliptic to suborbiculate, rarely oblanceolate or elliptic, margins usually flat, sometimes undulate, usually entire, sometimes inconspicuously denticulate, apex usually acute to obtuse, sometimes retuse.
stipules present or absent.
buds with unequal free tips 5–11 mm;
floral tube (50–)70–140(–160) mm;
sepals (25–)35–50 mm;
petals (25–)31–50(–52) mm;
filaments (13–)15–25(–28) mm, anthers(10–)14–20 mm;
style (75–)100–192 mm.
floral tube present or, rarely, absent;
sepals 2 or 4 (very rarely 3), deciduous with floral tube, petals, and stamens;
petals yellow, white, pink, red, rarely in combination.
broadly ellipsoid to globose, not twisted, wings 10–15(–24) mm wide, body 28–48(–74) × 6–8 mm.
= 14.
Oenothera macrocarpa subsp. incana
Onagraceae subfam. onagroideae
Subspecies incana occurs on the high plains in Clark, Comanche, Kiowa, and Meade counties, Kansas, south across Oklahoma as far east as Comanche and Harper counties to the Texas Panhandle to Garza and Knox counties; one collection is known from Taylor County, Texas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Genera 21, species 582 (16 genera, 246 species in the flora).
Onagroideae encompass the main lineage of the family, after the early branching of Ludwigia (R. A. Levin et al. 2003, 2004). This large and diverse lineage is distinguished by the presence of a floral tube beyond the apex of the ovary; sepals deciduous with the floral tube, petals, and stamens; pollen shed in monads (or tetrads in Chylismia sect. Lignothera and all but one species of Epilobium); ovular vascular system exclusively transseptal (R. H. Eyde 1981); ovule archesporium multicellular (H. Tobe and P. H. Raven 1996); and change in base chromosome number from x = 8 in Ludwigia to x = 10 or x = 11 at the base of Onagroideae (Raven 1979; Levin et al. 2003). Molecular work (Levin et al. 2003, 2004) substantially supports the traditional tribal classification (P. A. Munz 1965; Raven 1979, 1988); tribes are recognized to delimit major branches within the phylogeny of Onagroideae, where the branches comprise strongly supported monophyletic groups of one or more genera.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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