NORTH AMERICAN GERANIACEAE. 87 



Stems not fVom a caudex, but mostly perennial from slender rootstoeks. 



Flowers usually small, homogone, the styles about equalling or longer than 



the longest stamens Q. corniculata. 



Flowers large and showy, heterogone or appearing so. 



Repent, with adnate stipules; flowers doubtfully trimorphic. 



O. corniculata, var. (?) macrantha. 

 Erect, stipules none; flowers cleai-ly trimorphic. 



Low, slender-stemmed; leaflets not margined (Oregon). O- Siiksdorfii. 



Tall and rather stout, leaflets dark margined (Middle States). O. recurva. 



* * Acaulescent; leaves and scapes from the end of a slender perennial scaly rootstock; 

 flowers white or pinkish, somewhat yellow at base and mostly red-veined, homogone; 

 leaves palmately trifoliolate. 



Scapes 1-flowered; capsule round-ovoid . . . . , . O. acetosella. 

 Scapes umbellately several-flowered; capsules linear . . . O. trilliifolia. 



* * * Acaulescent; leaves and scapes from a scaly bulb; flowers heterogone, rose- violet; 

 leaves palmately 3-10-folioIate; sepals (and usually leaflets) tipped with orange callos- 

 ities. 



Leaflets constantly 3. 



Obcordate or transversely lunate-oblong; capsule round-ovoid . O. violacea. 



Obcordate-deltoid ; capsule linear-oblong ..... O. latifolla. 



V-shaped; capsule ovoid-oblong O. vespertilionis. 



Leaflets 3-5 (mostly 4), deeply obcordate O. divergens. 



Leaflets 5-10, narrow, deeply notched, bilobed, or Y-shaped . O. decajjhylla. 



1. O. DiCHONDRAEPOLiA, Gray, PI. "Wright., i, 27. Caulescent, a span to a foot high, 

 perennial, appressed-pubescent; branches spreading or procumbent, woody and rough- 

 barked at base; leaves unifoliolate, leaflet round-ovate, wavy-margined, cordate, abruptly 

 depressed and mucronate at apex, 12-30 mm. long; petiole as long, or somewhat exceed- 

 ing it; stipules setaceous, free from the petiole, often 10mm. long; flowers homogone 

 (?), 12 mm. long, solitary on axillary peduncles equal to or surpassing the leaves, and with 

 two setaceous bractsnear the summit; sepals triangular-lanceolate, acute, dilated at base; 

 petals spatulate, entire, submucronate and slightly ciliate above, half as long again as the 

 calyx; capsule round-ovoid, 10 mm. long, pubescent; seeds about three in each cell, with 

 prominent tubercles arranged in transverse, more or less oblique I'ows, 1.4 X 2.2 mm. — 

 N'ew Mexico {Wright) and Texas (Berlandier, Wright, Palmer, Reverchon) to Mexico. 

 —PI. 11, fig. 1. 



2. O. Beulaxdiepj, Torrey, Bot. Mex. Bound., 41. Caulescent, a span or less high, 

 perennial " from a slender subterranean rhizoma," somewhat woody below and much 

 branched, gray- or rusty-pubescent; leaves pinnatcly trifoliolate, estipulate, on petioles 

 about 15 mm. long; terminal leaflet obovate-oblong, 10-15 mm. long, on a stalk half as 

 long, lateral ones smaller, opposite, oblong, very short-stalked, all obliquely emai'ginate 

 at apex, nearly glabrous above; flowers heterogone (?), about 12 mm. long, umbellate at 

 the ends of axillary peduncles about equalling the leaves; umbels mostly 3-flowered ; 

 pedicels usually shorter than the flowers; sepals lanceolate, acute; petals obovate, suben- 



MEMOIRS BOSTON SOC. NAT. HIST., VOL. IV. 



