LIST OF FLORA 153 in November and in April. This Mexican plant is known in the Rio Mayo valley only from the valley of Curohui. Rhynchosia macrocarpa Benth. Frijolin D I S T . Foothills and barrancas, Sonora; Tepopa ( 1 4 1 6 ) , Agrimensor (3038), Canon Estrella ( 3 9 6 ) . Type locality: Aguascalientes. H A B . Slopes and bottom in Oak Forest. 2500-4000 feet. Yellow-flowered vine climbing on shrubs, no. 3038 on Lippia Gentryi. Flowers spring. Rhynchosia minima (L.) DC. D I S T . Barrancas, Sonora and Chihuahua; Bacachaca ( 1 4 5 4 ) , Guasaremos (1848, 2879). H A B . Grassy slopes and flats in Short-tree Forest and Oak Forest. 2500-3500 feet. A small, fine-stemmed, scandent perennial climbing on shrubs and stone fences. Flowers yellow; summer. Rhynchosia nigropunctata Wats. D I S T . Barrancas, Sonora; Tepopa (2239). H A B . Moist canyon slope in dense cover; Oak Forest. 3500 feet. A clambering vine with small purple flowers; May and June. Apparently a rare plant. Rhynchosia pyramidalis ( L a m . ) Urban Chanate pusi ( M ) D I S T . Barrancas, Sonora and Chihuahua; Carimechi ( 1 1 6 8 ) , Sierra Charuco ( 1 8 2 1 ) . Recorded observations: Alamos, San Bernardo, Guasaremos. H A B . Alluvial sandy soils in arroyo margins; Short-tree Forest. 800-2500 feet. A vine climbing high on shrubs and trees; flowers through the fall following the summer rains. T h e bright, lacquer-like seeds, half red and half black, ripen through the winter, and from them the plant takes its Mayo name "pusi," eye, and "chanate," a bird. Rhynchosia rariflora Standi., Field Mus. Nat. Hist., Bot. Ser., vol. 1 7 , p. 264, 1937 D I S T . Barrancas, Chihuahua; Guasaremos (2883 type). Type locality: Guasa­ remos, Chihuahua. H A B . With grasses on gentle slope of valley margin in Short-tree Forest at foot of oaks. 3000 feet. A small, climbing vine with yellow flowers; September. On the slopes of the Guasaremos valley, the only observed locality, it was obscured in the rife bunch grasses, on which it clung. Rhynchosia sp. D I S T . Lowlands, Sonora; San Bernardo (2278). H A B . Arroyo margin; Short-tree Forest. 1000 feet. Eriosema grandiflorum (Schl. & Cham.) Seem. Igualamilla D I S T . Montane, Sonora and Chihuahua; Sierra L a Chuna (collected in 1 9 3 3 ) , Guasaremos ( 1 8 3 7 ) , Canon Estrella (434), Algodones, Cedros range (460). Recorded observations: Mescales, Sierra Saguaribo. Type locality: Hacienda de la Laguna, Veracruz. H A B . Rocky hill slopes in Oak Forest. 3000-4500 feet.