Oenothera cespitosa subsp. crinita
Onagraceae tribe Onagreae
cespitose evening-primrose
unbranched to many-branched, and then sometimes producing dense clumps 5–50 cm diam., 2–14 cm.
1.7–10(–18) × (0.3–)0.5–2.5(–3.4) cm;
petiole (0.2–)3–5(–8) cm;
blade usually oblanceolate to linear-oblanceolate, rarely obovate, margins subentire, sinuate, or dentate to pinnatifid.
alternate or basal;
stipules absent.
floral tube (28–)35–75(–85) mm;
sepals (15–)18–25(–27) mm;
petals fading rose or sometimes deep rose purple, (16–)20–30(–35) mm;
filaments (6–)10–17(–20) mm, anthers 6–8(–10) mm;
style (45–)60–90(–105) mm.
usually actinomorphic, rarely slightly zygomorphic (in Oenothera), (3 or)4-merous;
stamens 2 times as many, or rarely as many, as sepals;
pollen usually shed in monads, rarely tetrads (Chylismia sect. Lignothera).
a dry capsule, usually dehiscent, sometimes indehiscent.
usually falcate or sigmoid, especially when young, also somewhat flattened, ellipsoid-ovoid to lanceoloid, 10–31(–34) × 4–9 mm, valve margins with 8–15 tubercles or these coalesced into a sinuate ridge;
pedicel 0.5–1 mm.
obovoid, oblong, or ± triangular, 2.9–3.5 × 1.1–2 mm, embryo 1/2–2/3 of seed volume, surface papillose, reticulate or very minutely roughened;
seed collar membrane depressed and often splitting, becoming separated from collar at maturity, margin conspicuously sinuate throughout, surface often ribbed, ribs forming partial or complete vertical partitions in collar.
few to numerous, without hairs or wings, [very rarely with asymmetrical dry wing (Xylonagra)], or with dry (Oenothera), erose or smooth wing, or with thick, papillate wings (Chylismiella).
= 14, 28.
Oenothera cespitosa subsp. crinita
Onagraceae tribe Onagreae
Subspecies crinita is the most polymorphic subspecies of Oenothera cespitosa; it is also the least understood. W. L. Wagner et al. (1985) grouped two series of populations that appear to intergrade together within the limits of this subspecies. One population is a morphologically relatively uniform form characterized by a many-branched habit, which may form dense clumps to 50 cm diameter, leaves that are 2–7 cm, floral tubes 25–60 mm and petals that fade to a rose color, and it occurs at high elevations on rocky, limestone sites or at lower elevations on extreme, chalky, white limestone and dolomite substrates or sometimes scree slopes. A more common form occurs at low to mid elevations in pinyon-juniper woodlands to Great Basin or Mojave Desert scrub on rocky slopes, talus, or along arroyos that is much less compact with one to several clustered rosettes, rarely more, with leaves 8–16 cm, floral tubes 45–75 mm, and petals that fade rose purple. The common form also grows on limestone and dolomite but, unlike the clumped form, it does not seem to be restricted to it. To compound the problem, many foothill and valley populations of subsp. crinita intergrade extensively with subspp. cespitosa and marginata.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Genera 13, species 265 (12 genera, 199 species in the flora).
Onagreae account for more than half the total genera in Onagraceae and diversified from a center in southwestern North America (L. Katinas et al. 2004). Delimitation of the tribe by W. L. Wagner et al. (2007) differs from previous ones by the exclusion of Gongylocarpus, now in its own tribe, by the segregation of eight genera (Camissoniopsis, Chylismia, Chylismiella, Eremothera, Eulobus, Neoholmgrenia, Taraxia, and Tetrapteron) from Camissonia, and by the inclusion of three previously separate genera (Calylophus, Gaura, and Stenosiphon) in Oenothera. Within the branch of the family that lacks stipules (Gongylocarpeae, Epilobieae, and Onagreae), the last two tribes form a clade that has very strong molecular support (R. A. Levin et al. 2003, 2004), but no obvious morphological synapomorphy. The clade may be defined by a cytogenetic change from the base chromosome number of x = 11 found in Circaeeae, Gongylocarpeae, and Lopezieae, to x = 18 in Epilobieae, and x = 7 in Onagreae; however, these changes could also have occurred independently. Other than the new chromosome number x = 7, the only apparent morphological synapomorphy for Onagreae alone is pollen with prominent apertural protrusions (J. Praglowski et al. 1987, 1989), a character state also found in Circaeeae (Praglowski et al. 1994). The monophyly of Onagreae has moderate (Levin et al. 2004) to strong support (V. S. Ford and L. D. Gottlieb 2007).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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