M. primatidula "Amerig. merid le. Chili. M. Cl. Day Stem broken off but portions present 3-5 dm. pub. at nodes with a very fine white pubescence made up of branched trichomes, branched above, flexuose, rigid, becoming glabrous; leaves pustinate covered with a whitish pub., pub. easily rubbed off, divisions linear; infl. 5-1 dm. long, flexuose; pedicels sparsely pub., 3-6 mm. long; ridiguan almost sessile, valves nerved at center, tuberculate at edges of hump; narrowly winged, very slightly longer than broad, ca. 4-5 mm. long, scales present between tubercles & cat. nerve. sepals erect, sparsely pub., not noticeably secate, petals yellowish or whitish, linear, ca. 6-8 mm. long.