Mimosa grahamii |
Mimosa dysocarpa |
|
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Graham Mimosa, Graham's Mimosa |
velvetpod Mimosa |
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Habit | Shrubs, erect, 0.7–1.5 m, armed. | |
Stems | terete, tomentose or glabrescent; prickles irregular along internodes, recurved or straight. |
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Leaves | stipules linear to subulate, 4–7 mm, tomentose; petiole 0.6–1 cm; primary rachis 2.5–7.5 cm; pinnae 5–11 pairs; leaflets 6–14 pairs, blades obliquely linear-lanceolate or lanceolate-oblong, 3–6 × 1–2.5 mm, margins sericeous, 1 or 2 eccentric veins prominent, apex acute, mucronulate, surfaces light green, sericeous abaxially, dark green, glaucous, sericeous or glabrous adaxially. |
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Inflorescences | 50–150-flowered, axillary, spikes, solitary, in fascicles of 2 or 3, or aggregated in racemes, 20–50(–80) mm; bracts linear-spatulate, 1/3–1/2 corolla length. |
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Peduncles | 1–1.5(–2) cm. |
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Pedicels | 0 mm. |
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Flowers | bisexual and staminate; calyx campanulate, lobes 4 or 5, 1/2 corolla length; corolla purple-pink, densely sericeous, lobes 4 or 5, 1/3–1/2 corolla length; stamens 8 or 10, filaments distinct to bases, pink; ovary sessile, tomentose; style attenuate at apex; stigma poriform. |
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Legumes | sessile, straight or curved, linear-oblong, 40–50 × 5–7 mm, constricted between seeds, valves with (2–)4–9 segments, margin unarmed or sparsely prickly, apex apiculate, faces tomentose. |
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Seeds | (2–)4–9, reddish brown, lenticular, 5 × 4 × 3 mm, testa smooth, fissural line 50%. |
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Mimosa grahamii |
Mimosa dysocarpa |
|
Phenology | Flowering Jun–Sep; fruiting Sep. | |
Habitat | Dry scrublands, open slopes, desert grasslands, steep rocky slopes with oaks, pines, and grasses. | |
Elevation | 1200–2200 m. (3900–7200 ft.) | |
Distribution |
n Mexico; c Mexico; s United States
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AZ; NM; TX; Mexico (Chihuahua, Durango, Sonora, Zacatecas)
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Discussion | Varieties 2 (1 in the flora). Variety prolifica (S. Watson) Barneby occurs in northern Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Mimosa dysocarpa is known from Cochise, Pima, Pinal, Santa Cruz, and Yavapai counties in Arizona, Grant, Hidalgo, Luna, and Socorro counties in New Mexico, and Brewster, Jeff Davis, and Presidio counties in Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Caesalpinioideae (Mimosoid clade) > Mimosa | Fabaceae > subfam. Caesalpinioideae (Mimosoid clade) > Mimosa |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Mimosopsis grahamii | M. dysocarpa var. wrightii, M. wrightii |
Name authority | A. Gray: Smithsonian Contr. Knowl. 5(6): 52. (1853) — (as grahami) | Bentham: Smithsonian Contr. Knowl. 3(5): 62. (1852) |
Web links |