Senna pendula |
Senna pilosior |
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climbing cassia, valamuerto |
trans-Pecos senna |
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Habit | Herbs, perennial, to 0.7 m. Leaves slightly sclerophyllous, 1.5–7.5 cm, hairy; stipules tardily deciduous; extrafloral nectary 1, between leaflet pair, stipitate; leaflet pairs 1, blades broadly, obliquely obovate to oblong-obovate, 15–40 × 10–25 mm. | |
Racemes | 2–6-flowered; bracts caducous. |
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Pedicels | 6–15 mm. |
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Flowers | monosymmetric; calyx persistent into developing fruit, pale green; corolla yellow, longest petal 8.5–10 mm; androecium not heterantherous, stamens 7, staminodes 3; anthers 2.3–3.7 mm, dehiscing by 1 apical pore, apical appendage 0; gynoecium nearly linear, ovules 16–26; ovary densely hairy; style linear. |
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Legumes | erect, flat, straight, 20–40 × 5.5–7.5 mm, corrugated over seeds, dehiscing apically downward, with 1 series of seeds. |
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Seeds | dull pinkish or grayish brown, pyriform. |
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Senna | pendula is often confused with close relative S. bicapsularis, which is absent from North America and has shorter pedicels, only to 5 mm (H. |
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s | . Irwin and R. |
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c | . |
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Barneby | 1982; B. |
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Marazzi | et al. |
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2006b | ). |
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2n | = 28. |
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Senna pendula |
Senna pilosior |
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Phenology | Flowering spring–mid fall. | |
Habitat | Sandy banks, desert washes. | |
Elevation | 600–1500 m. (2000–4900 ft.) | |
Distribution |
Mexico; Central America; South America; West Indies [Introduced, Florida; introduced also in Africa (South Africa), Pacific Islands, Australia]
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TX; Mexico (Chihuahua, Coahuila, Durango) |
Discussion | Varieties 18–20 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senna pilosior is the only senna in North America with sepals persisting into fruit development and falling off before fruit matures and dehisces. Persistent sepals are diagnostic to distinguish S. pilosior from the close relatives S. bauhinioides and S. durangensis; the trio is, in fact, characterized by a history of repeated misidentifications (H. S. Irwin and R. C. Barneby 1982). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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 pendula, Chamaefistula pendula | Cassia bauhinioides var. pilosior, C. pilosior |
Name authority | (Humboldt & Bonpland ex Willdenow) H. S. Irwin & Barneby: Mem. New York Bot. Gard. 35: 378. (1982) | (B. L. Robinson ex J. F. Macbride) H. S. Irwin & Barneby: Phytologia 44: 500. (1979) |
Web links |