Senna covesii |
Senna durangensis |
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Coues' cassia, Coves' cassia, desert senna |
Durango senna |
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Habit | Herbs, perennial, to 0.7 m. Leaves slightly sclerophyllous, 2–10 cm, hairy; stipules persistent, to 1 mm wide; extrafloral nectaries between all leaflet pairs, stipitate; leaflet pairs 2–4, blades obovate to elliptic-obovate or oblong-elliptic, 10–38 × 5–19 mm. | |
Racemes | (2–)4–8-flowered; bracts caducous. |
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Pedicels | 8–17 mm. |
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Flowers | monosymmetric; calyx pale green, pinkish, or yellowish; corolla golden yellow, longest petal 9–15 mm; androecium not heterantherous, stamens 7, staminodes 3; anthers 2.5–4.2 mm, dehiscing by 1 apical pore, apical appendage 0; gynoecium linear, slightly incurved, ovules 28–42; ovary hairy; style filiform, incurved. |
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Legumes | erect, cylindrical, slightly curved, 180–350 × 50–80 mm, shallowly corrugated over seeds, dehiscing apically downward. |
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Seeds | brown, rhomboid. |
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Senna covesii |
Senna durangensis |
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Phenology | Flowering late winter–early fall. | |
Habitat | Sandy and gravelly desert washes, slopes, and stony hills, disturbed desert roadsides. | |
Elevation | 0–1200 m. (0–3900 ft.) | |
Distribution |
AZ; CA; NM; NV; Mexico (Baja California, Sinaloa, Sonora)
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n Mexico; Texas |
Discussion | Varieties 2 (1 in the flora). Senna durangensis has often been confused with S. pilosior, which is characterized by a persistent calyx (H. S. Irwin and R. C. Barneby 1982); see discussion under 20. S. pilosior for differences. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Caesalpinioideae (excluding Mimosoid clade) > Senna | Fabaceae > subfam. Caesalpinioideae (excluding Mimosoid clade) > Senna |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Cassia covesii, Earleocassia covesii | Cassia durangensis |
Name authority | (A. Gray) H. S. Irwin & Barneby: Phytologia 44: 499. (1979) | (Rose) H. S. Irwin & Barneby: Phytologia 44: 499. (1979) |
Web links |