Gayophytum diffusum
Onagraceae tribe Onagreae
diffuse groundsmoke, spreading groundsmoke
erect, branched or unbranched near base, much branched distally, usually with 1 or 2 nodes between branches, distal branching dichotomous or lateral branches shortened, 5–60 cm.
reduced distally, 10–60 × 1–5 mm;
petiole 0–10 mm;
blade very narrowly lanceolate.
alternate or basal;
stipules absent.
with flowers arising usually as proximally as first 1–20 nodes from base.
sepals 0.9–3(–5) mm, reflexed singly or in pairs;
petals 1.2–5(–7) mm;
pollen 90–100% fertile;
stigma hemispheric to subglobose, exserted beyond anthers of longer stamens or surrounded by them at anthesis.
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.
ascending to reflexed, subterete, 3–15 × 1–1.5 mm, with inconspicuous or conspicuous constrictions between seeds, valve margins somewhat undulate, all valves free from septum after dehiscence, septum straight or sinuous;
pedicel 2–10(–15) mm, usually shorter than capsule.
(3–)6–18, all or most developing, arranged ± parallel to septum and in alternating pattern between locules, crowded, overlapping, often appearing to form 2 irregular rows in each locule, or well spaced, forming a single row in capsule, brown, sometimes mottled with gray, 1–1.6 × 0.5–0.8 mm, glabrous or puberulent.
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).
= 28.
Gayophytum diffusum
Onagraceae tribe Onagreae
Subspecies 2 (2 in the flora).
Gayophytumdiffusum consists of a diverse assemblage of tetraploid populations, some of which are similar to every known diploid species except G. humile. The combination of characteristics of at least five diploid species in various ways suggests that the complex is derived from several independently formed allopolyploids that subsequently hybridized and segregated to produce the observed diversity.
Populations of Gayophytum diffusum differ in breeding behavior. Populations with relatively large flowers and stigmas that extend beyond the anthers are obviously outcrossing, whereas most populations are small-flowered and modally self-pollinated. It is among the latter that the greatest morphological diversity is found. Often two or more morphologically different, apparently true-breeding strains can be found growing together. In such a variable complex, recognition of infraspecific taxa becomes arbitrary. In this treatment the striking morphological differences associated with breeding behavior have been used as a basis for subspecies recognition. At some localities the two subspecies intergrade.
(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.)
1. Petals 3–5(–7) mm; sepals 2–3(–5) mm; stigma usually exserted beyond anthers of longer stamens at anthesis. | subsp. diffusum |
1. Petals 1.2–3 mm; sepals 0.9–2 mm; stigma surrounded by anthers at anthesis. | subsp. parviflorum |
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OR, 
WA - Local Web sites: CalFlora, CalPhotos,
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