Senna racemosa var. coalcomanica

Title

Senna racemosa var. coalcomanica

Authors

Howard S. Irwin, Rupert C. Barneby

Scientific Name

Senna racemosa var. coalcomanica H.S.Irwin & Barneby

Description

196c. Senna racemosa (P. Miller) var. coalcomanica Irwin & Barneby, var. nov., foliolorum numero cum var. moctezumae et var. sororia congrua, ab ambabus pube foliolorum appressa, ab hac ulterius ovario glabro diversa.-MEXICO. Michoacan: Aquila, distr. Coalcoman, 140 m, 21.IX.1938 (fl), G. B. Hinton 12640.-Holotypus, NY; isotypi, K, MICH, US.-Ibid., 6.XI. 1941 (fl), Hinton 16105.- Paratypi, K, MICH, NY, US.

Foliage strigulose with straight subappressed hairs up to 0.4-0.6 mm, the vesture of inflorescence a little looser and rusty; lvs 16-20 cm; lfts 8-9 pairs, up to 2.8-4.8 x 1.2-2 cm, obovate or elliptic-obovate obtuse mucronulate, the 6-8 pairs of secondary veins and sometimes the tertiary venulation of mature blades finely prominulous above; outer sepals 3.5-4.5 mm, the inner ones only thinly pubescent dorsally 6-7 mm; 4 petals 13.5-15 mm, the odd one 15-17 mm; anthers thinly pilosulous toward apex with weak hairs up to ±0.4 mm; ovary glabrous; style ±3 mm; pod unknown.-Collections: 3.

Rocky hillsides and stream banks, in drought-deciduous brush-woodland, 140-500 m, local, known only from the Pacific foothills in Colima (mun. Coquimuatlan) and s.-w. Michoacan (mun. Aquila) in s.-w. Mexico.-Fl. X-I.

For differential commentary see under the preceding and following.