Stylocline sonorensis |
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mesquite neststraw, Sonoran neststraw |
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Habit | Plants 2–10(–15) cm. |
Leaves | blunt (proximal) or acute (median and distal), mucronate, longest 6–13 mm; largest capitular leaves ± elliptic to narrowly ovate, 3–10 × 2–3 mm. |
Receptacles | clavate, 1.2–2.2 mm, heights 2.8–3.5 times diams.; scars ± evenly distributed, mamillate. |
Phyllaries | 0, vestigial, or falling, ± subulate, mostly 0.1–0.5 mm, unequal. |
Heads | in cymiform to ± paniculiform, sometimes dichasiform arrays, ± spheric, largest 3.5–4.5 × 3–4 mm, thickly lanuginose. |
Cypselae | 0.6–0.8 mm, slightly compressed; pappi: staminate of (1–)3–8 barbellate bristles 0.9–1.3 mm (proximal barbs longer, spreading). |
Pistillate | paleae: longest 1.9–3.1 mm, winged distally; wings ± elliptic, widest in distal 1/3 of palea lengths; bodies (except midnerves) chartaceous; outermost paleae ± saccate. |
Functionally | staminate florets 2–5; ovaries partially developed, 0.3–0.6 mm; corollas 0.9–1.4 mm. |
Stylocline sonorensis |
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Phenology | Flowering and fruiting Mar–May. |
Habitat | Grassy hillsides, sandy drainages, with mesquite (Prosopis) |
Elevation | 400–1400 m (1300–4600 ft) |
Distribution |
AZ; CA; Mexico (Sonora) |
Discussion | Stylocline sonorensis is known from southeastern Arizona and northeastern Sonora. A disjunct, 1930 California occurrence was from apparently suitable habitat; recent searches have not relocated it. Stylocline sonorensis is illustrated in J. D. Morefield (1992). It is superficially similar to S. citroleum; its closest relative is S. micropoides. Its ancestors may have been hybrid products involving Logfia depressa or its progenitors (Morefield). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 452. |
Parent taxa | |
Sibling taxa | |
Name authority | Wiggins: Contr. Dudley Herb. 4: 26. (1950) |
Web links |