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Senna species [Fabaceae]

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Scientific Name Senna bauhinioides (Cassia bauhinioides) USDA PLANTS Symbol SEBA3
Common Name Twinleaf Senna ITIS Taxonomic Serial No. 505146
Family Fabaceae (Pea) SEINet
Reference
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Description Habitat: Dry, gravelly soils in flats and plains, along washes and on rocky slopes, from 2,000 to 5,500 ft.
Plant: Perennial with spreading or ascending stems, usually branched, up to 16 inches long; stems with gray, woolly hairs.
Leaves: Compound leaves with one pair of unsymmetrical oblong to ovate leaflets, 3/4 to 1-3/4 inches long and 3/8 to 1-1/4 inches wide on petioles about the same length as the leaflets; thin, erect, brownish gland between the leaflets; fine hairs on both leaflet surfaces.
Inflorescence: Clusters of 1 to 3 pale yellow flowers on peduncles arising from leaf axils and 3/4 to 1-5/8 inches long; drooping flowers about 1-1/4 inches across with 5 petals with obvious brownish veins; 10 light brown stamens, the upper 3 much shorter; hairy sepals about 1/4-inch long.
Bloom Period: April to August.
Fruit: Slightly curved pods 1-1/4 to 1-5/8 inches long and 1/4 to 1/3 inch wide, covered with fine hairs.
References: SEINet and Cassia bauhinioides in "Manual of the Vascular Plants of Texas" by Correll and Johnston.
Note: Very similar to S. durangensis with the main obvious differences being the leaf shape, the number of flowers per cluster and the shape of the pod. The images here are hopefully correctly identified.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Senna durangensis (Cassia durangensis) USDA PLANTS Symbol SEDU
Common Name Durango Senna ITIS Taxonomic Serial No. 505151
Family Fabaceae (Pea) SEINet
Reference
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Description Habitat: Desert habitat, dry, gravelly, limestone soils; 1500 to 3500 ft.; in the US, found only in Brewster and Presidio counties.
Plant: Low-growing perennial, up to 20 inches tall, usually much less; few to several stems densely covered with fine grayish or yellowish hairs.
Leaves: Compound leaves with a pair of unsymmetrical broadly oblong to nearly round leaflets, 1-3/8 to 2 inches long and 3/4 tp 1-3/8 inches wide on petioles generally longer than the leaflets; thin, erect, brownish gland between the leaflets; fine hairs on both leaflet surfaces.
Inflorescence: Clusters of 1 to 6 pale yellow flowers on peduncles arising from leaf axils and above the leaflets; drooping flowers about 3/4-inch across with 5 petals with obvious brownish veins; 10 light brown stamens, the upper 3 much shorter; hairy sepals about 1/4-inch long.
Bloom Period: May to July and in the fall.
Fruit: Usually erect and straight (sometimes slightly curved) pods 1-1/4 to 1-5/8 inches long and 1/4 to 1/3 inch wide, densely covered with fine hairs.
References: Cassia durangensis in "Manual of the Vascular Plants of Texas" by Correll and Johnston; "Wildflowers of Texas" by Michael Eason, American Southwest and SEINet.
Note: Very similar to S. bauhinioides with the main obvious differences being the leaf shape, the number of flowers per cluster and the shape of the pod. The images here are hopefully correctly identified. Also, "Little Big Bend" by Roy Morey shows the very similar S. pilosior but there is little in the literature to corroborate an ID.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Senna lindheimeriana (Cassia lindheimeriana) USDA PLANTS Symbol SELI4
Common Name Velvet-leaf Senna ITIS Taxonomic Serial No. 505159
Family Fabaceae (Pea) SEINet
Reference
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Description Habitat: Dry, calcareous soils.
Plant: Bushy perennial with 1 to several stems covered with fine hairs; 3 to 6 feet high.
Leaves: Alternate, pinnately-compound leaves 5 inches long with 5 to 8 pairs of oblong to elliptic, sometimes pointed, leaflets, each 1 to 2 inches long, both sides covered with soft hairs.
Inflorescence: Golden-yellow flowers 1-1/2 inch wide borne in terminal racemes arising from leaf axils; 5 elliptic petals with obvious veins; stamens straw-colored to light brown to reddish.
Bloom Period: August to October.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Wildflowers of Texas" by Geyata Ajilvsgi and SEINet.
BONAP Distribution Map

Texas Status:
Native
Scientific Name Senna roemeriana (Cassia roemeriana) USDA PLANTS Symbol SERO8
Common Name Two-leaf Senna ITIS Taxonomic Serial No. 505174
Family Fabaceae (Pea) SEINet
Reference
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Description Habitat: Dry, calcareous or clay soils; hillsides, prairies, open areas.
Plant: Erect/ascending perennial with a few to many pubescent-hairy stems 1 to 2 feet high.
Leaves: Alternate, compound leaves on petioles up to 1 inch long, with one pair of lanceolate or lance-linear, leaflets, each 1-1/4 to 2-3/8 inches long and up to 1/2-inch wide, both sides covered with soft hairs.
Inflorescence: Two to six golden-yellow flowers 1-1/8 inch or more wide borne in terminal racemes arising from leaf axils; 5 elliptic petals with obvious brownish veins; stamens straw-colored to light brown.
Bloom Period: April to September.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Wildflowers of Texas" by Geyata Ajilvsgi and "Wildflowers of the Texas Hill Country" by Marshall Enquist.
BONAP Distribution Map

Texas Status:
Native

© Tom Lebsack 2022