Phacelia. HYDROPHYLLACE^l. 169 



P. pusilla, Torr. Very small, not over 3 inches high, simple or loosely branching, glan- 

 dular-pubescent : leaves broadly oval or oblong, entire, a quarter to half an inch long : 

 flowers few in a loose raceme, on filiform pedicels : corolla white, not twice the length of 

 the narrow linear or obscurely spatulate calyx-lobes : capsule narrow-oblong, obtuse and 

 mucronulate, 18-24-seeded. Watson, Bot. King, 253 ; Gray, 1. c. Western part of 

 Nevada to the borders of California, " under sage-brush and junipers," Watson. Corolla 

 hardly but capsule fully 2 lines long. Seeds somewhat pyriform, roughish-scrobiculate. 

 Pedicels 1 to 5 lines long. 



H- -H- -H- Flowerslooselvracemo.se in fully developed inflorescence: calyx shorter than the cam- 

 panulate corolla, rather longer than the short-pointed capsule : leaves round-cordate and creuately 

 lobed or repand, obscurely palmately veined. 



P. rotundifolia, Torr. Diffusely branched, 2 to 4 inches high, glandular-hirsute: leaves 

 crenately 7-13-toothed or even lobed, mostly with a deep-cordate base (a quarter to a full 

 inch long), usually much shorter than the petiole: pedicels shorter than the linear-spatula te 

 calyx-lobes : corolla white : style obscurely 2-cleft at apex : capsule oval-oblong, abruptly 

 pointed, 60-100-seeded. Watson, Bot. King, 253 ; Gray, 1. c. S. E. borders of California, 

 near Fort Mohave, to S. Utah and Arizona, Cooper, Palmer, Parry. Corolla 2 lines long. 

 Capsule 2 lines long. Seeds globular, scrobiculate. 



7. MICROGENETES, Gray. Ovules and seeds of the preceding section ; but 

 the latter oblong and strongly corrugated transversely (vermiculiform !) : style 

 2-cleft only at the apex : stamens unequal, included : corolla with internal appen- 

 dages present or rarely wanting : low annuals, all W. American : leaves mostly 

 pinnatiiid. Proc. Am. Acad. x. 32G. 



* Corolla short, almost rotate; the appendages 10 transverse plicae in the throat, remote from the 

 stamens! Helminthospermum, Torr. in herb. 



P. micrantha, Torr. Slender, paniculatcly branched, a span or more high, minutely 

 hirsute-glandular : leaves membranaceous, pinnately parted into 5 to 9 obovate or oblong 

 very obtuse and mostly entire lobes ; the lower with margined petiole, the upper with 

 dilated and sometimes auriculate partly clasping base : racemes geminate or panicled, 

 very loose: pedicels as long as the calyx: corolla (bright blue with a yellowish tube, or 

 sometimes pale) little exceeding the obovate or spatulate and enlarging calyx-lobes: cap- 

 sule globular, obtuse, 20-24-seeded. Bot. Mex. Bound. 144; Gray, I.e., & Bot. Calif. 

 i. 511. New Mexico and Arizona, from the Rio Grande near El Paso to S. Utah, and the 

 borders of California. Corolla barely 2 lines in diameter when expanded: no vertical 

 appendages at the base of the stamens and on the intermediate veins, but a pair of com- 

 pletely transverse short and narrow folds high upon the short tube, stretching from the mid- 

 vein of each lobe nearly to the lateral vein which springs from near its base. Style short, 

 glabrous. Calyx in fruit 2 lines long. Seeds cylindraceous, incurved, very deeply 

 rugose transversely and tuberculate. 



* * Corolla funnelform or cylindraceous; the appendages vertical, long and narrow, united more 

 or less to the base of the filaments (in the Chilian P. Cuminf/u obsolete): style more or less 

 hairy below in our species : seeds miuutel v reticulated as well as coarselv corrugated : leaves chiefly 

 pinnatifid, and the petioles naked. Mlcrogenetes, A.DC. Prodr. ix.'232. Phacelia Euylypta, 

 Watson, Bot. King, 1. c. 



-t- Corolla white or pale purple, slightly longer than the little-dilated calyx-lobes, 2 or at most 

 3 lines long. 



P. Ivesiana, Torr. About a span high, diffusely much branched from the base, hirsute- 

 pubescent and glandular: leaves pinnately parted into 7 to 15 linear or oblong and entire 

 or incisely few-toothed lobes, rarely bipinnatificl : racemes loose, 6-20-flowercd : narrow 

 appendages of the corolla adnate to the filament only at base: capsule oblong, 16-24- 

 seeded. Ives Colorad. Exped. Bot. 21; Watson, Bot. King, 254. Utah, Nevada, and 

 Arizona, from Salt Lake to the south-eastern borders of California. This species most 

 resembles P. Cwmingii, the Microyenetcs Cuminrjli, A.DC. Narrow calyx-lobes becoming 3 

 or 4 lines long, and conspicuously surpassing the capsule. Seeds over half line long, 

 strongly rough-corrugated. 



* ) Corolla conspicuously longer than the calyx; the limb violet or blue-purple; the throat and 

 tube yellow or whitish. 



