Senna multifoliolata var. metaxi

Title

Senna multifoliolata var. metaxi

Author(s)

Howard S. Irwin, Rupert C. Barneby

Scientific Name

Senna multifoliolata var. metaxi H.S.Irwin & Barneby

Description

91b. Senna multifoliolata (P. G. Wilson) var. metaxi Irwin & Barneby, var. nov., stipulis chartaceis planis ovulorumque numero cum var. multifoliolata congruens sed florum minorum sepalo intimo ± 11 tantum (nec 17) mm, petalis 2 angustis ±24 (nec 30-32) mm, filamentis abaxialibus 12-13 (nec 17-22) mm longis styloque breviori ±6.5 (nec 10-11.5) mm longo diversa.—MEXICO. Guerrero, [Distr. Mina] mun. Zirandaro: Par- acho, 2350 m, 1.XII.36 (fl), G. B. Hinton 9945.— Holotypus, NY; isotypi, K, US.—Mun. Zirandaro: Armenia, 10.V.37 (fr mat), Hinton 10177.—Paratypi fruct., K, NY.

Shrubs 4-5 m; stipules of var. multifoliolata, but flower smaller and style shorter, as given in key and diagnosis.—Collections: 2.

Pine-oak forest, 2350-2400 m, known only from near crest of Sa. Madre del Sur near Cerro Carboneras (± 101°20'W, 18°10'N) in mun. Zirandaro, Guerrero.— Fl. XII-I.—Parracata.

The two collections on which we base var. metaxi were cited in the protologue of Cassia multifoliolata as paratypes. The physical distance between vars. multifoliolata and metaxi, so far as now known, is not much more than 150 km, but is traversed by the Infernillo gorge of the lower Balsas River, a significant barrier.