SAXIFRAGACEAE (SAXIFRAGE FAMILY) 235 



Flowers in small clusters disposed in a prolonged and narrow panicle, greenish 

 or purplish. Calyx 5-cleft, bell-shaped. Petals entire, small or minute (some- 

 times wanting). Stamens 5, commonly slender as are also the 2 styles. Ovary 

 1-celled; the capsule 2-beaked, fully half adnate to the calyx, with 2 parietal 

 placentae alternate with its 2 beaks. 



Inflorescence open-paniculate; stamens well exserted. 



Peduncles glabrate; petioles somewhat hirsute . . . . 1. H. rubescens. 



Peduncles and petioles both very hirsute-hispid . . . . 2. H. hispida. 



Inflorescence spicate; stamens included or nearly so. 



Plants more or less glandular-hirsute . . . . . . 3. H. ovalifolia. 



Plants glabrate or glandular-puberulent on scape and inflorescence. 



Stamens at length exserted; petals filiform . . . . 4. H. bracteata. 



Stamens never exserted; petals spatulate. 



Flowers in a narrow unilateral raceme . , . . . 5. H. Hallii. 

 Flowers not unilateral. 



Scapes glabrous; inflorescence spicate . . . . 6. H. grossulariifolia. 



Scapes glandular-puberulent. 



Inflorescence paniculate . . . . . . 7. H. parvifolia. 



Inflorescence a simple raceme . . . . . 8. H. Williamsii. 



1. Heuchera rubescens Torr. Sitgr. Rep. 160. 1854. Scapes glabrous, 

 naked or with 1 or 2 foliar bracts, 3-5 dm. high: petioles more or Jess villous: 

 root leaves round-cordate or truncate, crenate-dentate, 3-5 cm. broad: in- 

 florescence an open panicle, minutely glandular; the pedicels long and very 



.slender: calyx narrowly campanulate: petals linear-spatulate, about twice as 

 long as the calyx-lobes: stamens early conspicuously exserted. (H. Sitgrea- 

 vesii Rydb. N. A. Fl. 22: 110. 1905.) Throughout our range and westward. 



2. Heuchera hispida Pursh, Fl. Am. Sept. 187. 1814. Scapes and peti- 

 oles densely hirsute or ciliate-glandular below, glandular-pubescent above; 

 scapes 2-4 dm. high: leaves round-re niform, somewhat 5-7-lobed and cre- 

 nate, glabrous above, pubescent beneath : inflorescence a narrow panicle, very 

 glandular, the pedicels short and rather stout: calyx broadly campanulate, 

 gibbous at base and very oblique at summit: petals spatulate, slightly 

 glandular, barely longer than the oblong calyx-lobes: stamens finally well 

 exserted. (H. ciliata Rydb. Mem. N. Y. Bot. Card. 1: 196. 1900.) Sides of 

 rocky cliffs; from the Mississippi valley (Illinois) west to northern Wyoming 

 and Montana and northward. 



3. Heuchera ovalifolia Nutt. T. & G. Fl. N. A. 1: 581. 1840. Villous and 

 viscid-glandular throughout, the leaves sparsely so: scapes stout, 2-3 dm. 

 high, foliar bracted near top: leaves 2-4 cm. long, oval to rotund, truncate or 

 subcordate at base, doubly and incisely crenate, with obtusish teeth: inflo- 

 rescence spicate, sometimes interrupted: calyx campanulate, the lobes as long 

 as the tube, ovate or oval, white or petaloid : petals wanting: stamens included, 

 the filaments only 1 mm. long. H. cylindrica. (H. saxicola E. Nels. Bot. Gaz. 

 30: 117. 1900.) Northern Wyoming to Montana and Idaho. 



4. Heuchera bracteata (Torr.) Ser. in DC. Prodr. 4: 52. 1830. Glabrous but 

 for the minute glandular-puberulence above: scapes short, usually several from 

 the very leafy crowns of the woody caudex, naked or foliar-bracteate, 1-2 dm. 

 high: leaves roundish, subcordate, incisely lobed and toothed, the teeth 

 usually spinulose: inflorescence short-spicate : calyx campanulate: petals fili- 

 form, a little longer than the calyx-lobes: stamens at last a little exserted. 

 Rocky cliffs; southern Wyoming, south through Colorado. 



5. Heuchera Hallii Gray, Proc. Acad. Phila. 62. 1863. Herbage glabrate, 

 inflorescence minutely glandular-puberulent: scapes 1-2 dm. high, naked or 

 foliar-bracteate: leaves round-cordate or subcordate, 1-3 cm. broad, slightly 

 5-lobed; the lobes crenate-dentate, with ciliate-spinulose teeth: inflorescence 

 a short unilateral spike-like raceme: calyx campanulate: petals narrowly 

 spatulate, with a long slender claw, nearly twice as long as the calyx-lobes: 

 stamens not at any time exserted. Rocky cliffs; southern Colorado. 



6. Heuchera grossulariifolia Rydb. Mem. N. Y. Bot. Gard. 1: 196. 1900. 

 Resembling the preceding, being low-caespitose, with glabrous scapes 1-2 dm. 

 high: leaves suborbicular-cordate, more or less deeply 5-cleft; the lobes cre- 

 nate, with spinulose-ciliate teeth: inflorescence a spike-like raceme (not 



