Senna multifoliolata var. eurystegia

Title

Senna multifoliolata var. eurystegia

Author(s)

Howard S. Irwin, Rupert C. Barneby

Scientific Name

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

Description

91d. Senna multifoliolata (P. G. Wilson) var. eurystegia Irwin & Barneby, var. nov., ab omnibus caeteris speciei formis floribus parvulis brachystylis, stylo 2-2.5 tantum (nec 6.5-11.5) mm longo, necnon legumine brevi lato ±8.5 x 1.7 cm pauciovulato (ovulis 14-18, nec 20-31) abstans— MEXICO. Guerrero: ±2 km al n.-e. del Campamento El Gallo, estri- baciones s.-w. del Cerro Teotepec, 17°28'N, 100°13'W, 2650 m, 28.1.1965 (fl, fr jun), J. Rzedowski & R. McVaugh 187.—Holotypus, MICH.

Treelets 6-8 m; stipules and pod as described in key to varieties; long abaxial petals 16-17 mm; stamens relatively short, the anthers of 3 abaxial ones ±6 mm, scarcely shorter than their filament.—Collections: 2.

Dense mixed mesophytic forest, sometimes along streams, 2600-2700 m, known only from the slopes of Cerro Teotepec near 100° 10'W in Sa. Madre del Sur, s.-centr. Guerrero.

This variety was collected first by George Hinton in 1939 but was left unnamed when his Mexican collections were under study at Kew. It is the most sharply marked form of S. multifoliolata, the broad folded stipules and the unexpectedly abbreviated androecium and style with proportionately diminished perianth being unmistakable.