Phaseolus montanus Brandegee

Seed Collecting Guide. RBG Kew (2013-2016)

Morphology General Habit

small, slender, scrambling and climbing, indeterminate vine, 0.5-1 m long

Morphology Stem

stems terete, 1.5-2 mm thick, mostly much less, much branched from near base, stipules triangular, acute, 1.25 mm long, 0.75 mm wide

Morphology Leaves

7-12.5 cm long; petiole about 2.5-4.5 cm long; petiolules 5-10 mm long, covered by minute hispid and uncinate hairs; terminal leaflet very narrow, almost linear to somewhat broader, acutely rounded at base, 4-5.5-7 cm long, 4-6 mm wide, some to 1 cm wide at about midpoint

Morphology Reproductive morphology Inflorescences

mostly a small erect pseudoraceme, mostly 1-flowered at each node, most nodes setting pods

Morphology Reproductive morphology Flowers

flower light purple to pink 7-8 mm long, calyx campanulate 3-3.5 mm long, the blade 4 mm long, 5 mm wide, not laterally enrolled, slightly emarginate at tip and glabrous or with a few minute hispid hairs

Morphology Reproductive morphology Fruits

pod straight to falcate, somewhat compressed, 4-5 cm long, 5-6 mm wide, 1.5 mm thick pronounced sutures; beak straight

Morphology Reproductive morphology Seeds

seed mostly oblongoid and smoothly rounded, sometimes with flattened ends, 3.4-4.5 mm long, 3-3.5 mm wide, 1.3-2.5 mm thick smooth, more or less shiny, black-speckled on light tan, sometimes almost completely solid black.

Ecology

rare. on rocky soils in dry grassland parks and along stream beds. altitude1000 - 2000 m

Distribution

Mexico, Guatemala.

Conservation

data deficient

Phenology

Flower (no data), fruit (november)