Senna roemeriana |
Senna hebecarpa |
|
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Roemer senna, twoleaf senna, twoleaf wild sensitive plant |
American senna, northern wild senna |
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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. | Herbs, perennial, to 0.8–2.2 m.Leaves mesophyllous, 13–23 cm, finely hairy; stipules caducous; extrafloral nectary 1, base of or along petiole, sessile or shortly stipitate; leaflet pairs 6–10, blades elliptic, oblong-elliptic, or lanceolate-elliptic, 30–60 × 10–20 mm. |
Racemes | 1–5-flowered; bracts caducous. |
25–37-flowered; bracts caducous. |
Pedicels | 9–16 mm. |
11–22 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. |
monosymmetric; calyx pinkish brown; corolla yellow, longest petal 8–12 mm; androecium heterantherous, stamens 7, staminodes 3; anthers of middle stamens 2.6–3.5 mm, of abaxial stamens 4–5 mm, truncate, dehiscing by 2 pores, apical appendage 0; gynoecium incurved, ovules 10–16; ovary densely hairy; style incurved, not dilated. |
Legumes | erect, subcylindrical, straight or slightly curved, 20–35 × 4.5–6.5 mm, corrugated over seeds, dehiscing apically downward. |
ascending, flat, curved downward, 60–115 × 5.5–8 mm, corrugated over seeds, tardily dehiscent, each seed compartment nearly as wide as long. |
Seeds | brown or pinkish brown, paddle-shaped or pyriform. |
ochre, yellowish brown, or dark reddish brown, ovoid or rhomboid. |
2n | = 28. |
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Senna roemeriana |
Senna hebecarpa |
|
Phenology | Flowering spring–early fall. | Flowering mid summer–early fall. |
Habitat | Mesquite grasslands, chaparral, draws in shortgrass prairies, barren hillsides, desert washes, roadsides. | Open woodlands, valley floors, creek banks, swamps, thickets, pastures. |
Elevation | 100–2000 m. (300–6600 ft.) | 0–500 m. (0–1600 ft.) |
Distribution |
NM; OK; TX; Mexico (Chihuahua, Coahuila, Nuevo León)
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CT; DE; IL; IN; KY; MA; MD; MI; MO; NC; NH; NJ; NY; OH; PA; TN; VA; VT; WV; ON
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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 | ||
Synonyms | Cassia roemeriana, Earleocassia roemeriana | Cassia hebecarpa, C. hebecarpa var. longipila, S. hebecarpa var. longipila |
Name authority | (Scheele) H. S. Irwin & Barneby: Mem. New York Bot. Gard. 35: 282. (1982) | (Fernald) H. S. Irwin & Barneby: Mem. New York Bot. Gard. 35: 446. (1982) |
Web links |