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climbing cassia, valamuerto

trans-Pecos senna

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.

Pedicels

6–15 mm.

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.

Legumes

erect, flat, straight, 20–40 × 5.5–7.5 mm, corrugated over seeds, dehiscing apically downward, with 1 series of seeds.

Seeds

dull pinkish or grayish brown, pyriform.

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.

s

. Irwin and R.

c

.

Barneby

1982;

B.

Marazzi

et al.

2006b

).

2n

= 28.

Senna pendula

Senna pilosior

Phenology Flowering spring–mid fall.
Habitat Sandy banks, desert washes.
Elevation 600–1500 m. (2000–4900 ft.)
Distribution
from USDA
Mexico; Central America; South America; West Indies [Introduced, Florida; introduced also in Africa (South Africa), Pacific Islands, Australia]
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Chihuahua, Coahuila, Durango)
[BONAP county map]
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
S. alata, S. armata, S. artemisioides, S. atomaria, S. bauhinioides, S. corymbosa, S. covesii, S. durangensis, S. hebecarpa, S. hirsuta, S. ligustrina, S. lindheimeriana, S. marilandica, S. mexicana, S. multiglandulosa, S. obtusifolia, S. occidentalis, S. orcuttii, S. pilosior, S. pumilio, S. ripleyana, S. roemeriana, S. surattensis, S. wislizeni
S. alata, S. armata, S. artemisioides, S. atomaria, S. bauhinioides, S. corymbosa, S. covesii, S. durangensis, S. hebecarpa, S. hirsuta, S. ligustrina, S. lindheimeriana, S. marilandica, S. mexicana, S. multiglandulosa, S. obtusifolia, S. occidentalis, S. orcuttii, S. pendula, S. pumilio, S. ripleyana, S. roemeriana, S. surattensis, S. wislizeni
Subordinate taxa
S. pendula var. glabrata
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)
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