Flora of North America species comparison

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Senna roemeriana

Senna hirsuta

Roemer senna, twoleaf senna, twoleaf wild sensitive plant

woolly senna, woolly wild sensitive-plant
Habit Herbs, perennial, to 0.7 m. Leaves slightly sclerophyllous, 2.5–9.5 cm, hairy; stipules caducous; extrafloral nectary 1, between leaflet pair, shortly stipitate; leaflet pairs 1, blades lanceolate-oblong or lanceolate, 20–70 × 4–14 mm.
Racemes

1–5-flowered;

bracts caducous.

Pedicels

9–16 mm.

Flowers

monosymmetric;

calyx caducous, pale green;

corolla yellow or orange-yellow, longest petal 12–17 mm;

androecium not heterantherous, stamens 7, staminodes 3;

anthers 2.2–3.3 mm, dehiscing by 1 apical pore, apical appendage 0;

gynoecium nearly linear, ovules 22–40;

ovary densely hairy;

style slightly incurved.

Legumes

erect, subcylindrical, straight or slightly curved, 20–35 × 4.5–6.5 mm, corrugated over seeds, dehiscing apically downward.

Seeds

brown or pinkish brown, paddle-shaped or pyriform.

2n

= 28.

Senna roemeriana

Senna hirsuta
Phenology Flowering spring–early fall.
Habitat Mesquite grasslands, chaparral, draws in shortgrass prairies, barren hillsides, desert washes, roadsides.
Elevation 100–2000 m. (300–6600 ft.)
Distribution
from FNA
NM; OK; TX; Mexico (Chihuahua, Coahuila, Nuevo León)
[WildflowerSearch map]
[BONAP county map]
from USDA
sw United States; Mexico; South America; Asia; Africa; Pacific Islands; Australia; worldwide in tropical and subtropical regions
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 7 (1 in the flora).

Recent molecular phylogenetic analyses of Senna hirsuta (B. Marazzi et al. 2006; Marazzi and M. J. Sanderson 2010) suggest that this species is paraphyletic and may actually represent more than one species.

(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. pendula, S. pilosior, S. pumilio, S. ripleyana, S. surattensis, S. wislizeni
S. alata, S. armata, S. artemisioides, S. atomaria, S. bauhinioides, S. corymbosa, S. covesii, S. durangensis, S. hebecarpa, S. ligustrina, S. lindheimeriana, S. marilandica, S. mexicana, S. multiglandulosa, S. obtusifolia, S. occidentalis, S. orcuttii, S. pendula, S. pilosior, S. pumilio, S. ripleyana, S. roemeriana, S. surattensis, S. wislizeni
Subordinate taxa
S. hirsuta var. glaberrima
Synonyms Cassia roemeriana, Earleocassia roemeriana Cassia hirsuta, Ditremexa hirsuta
Name authority (Scheele) H. S. Irwin & Barneby: Mem. New York Bot. Gard. 35: 282. (1982) (Linnaeus) H. S. Irwin & Barneby: Phytologia 44: 499. (1979)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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