Oenothera tubicula subsp. tubicula
Onagraceae subfam. onagroideae
1–many, unbranched to densely branched, decumbent to erect, 4–53 cm.
0.7–4.6 × 0.1–1.2 cm, sometimes fascicles of small leaves 0.2–1.5 cm present in non-flowering axils;
petiole 0–0.2 cm;
blade linear to ovate or obovate, base attenuate, margins entire, apex acute.
stipules present or absent.
usually several per stem opening per day near sunrise;
buds with free tips 0.5–2 mm;
floral tube 5–25(–33) mm, funnelform in distal 1/2 or more;
sepals 3–13 mm;
petals yellow, fading pale pink or pale purple, 5–20(–25) mm;
filaments 1–6 mm, anthers 2–7 mm, pollen 85–100% fertile;
style 9–30(–40) mm, stigma yellow, quadrangular, usually exserted beyond anthers.
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.
8–20 × 1.5–2.5 mm, hard, promptly dehiscent throughout their length.
obovoid, 1–1.4 mm.
= 14.
Oenothera tubicula subsp. tubicula
Onagraceae subfam. onagroideae
Subspecies tubicula is known from Guadalupe County, New Mexico, south in the western side of the Pecos River drainage to western Texas, where it occurs from Culberson County east to Howard County, thence south through Brewster, Presidio, and Terrell counties, and probably most of central Coahuila, to northern Zacatecas, southwestern Nuevo León, and southwestern Tamaulipas.
(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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