SAXIFRAGACEAE (SAXIFRAGE FAMILY) 233 



Stems decumbent, rooting at base, 3-5 mm. long: flowers sessile or nearly so: 

 petals greenish, twice as long as the sepals: follicles ovoid, 8-10-seeded. 

 Tillaea angustifolia. .Wet muddy banks; across the continent; reported from 

 Colorado. 



2. SEDUM L. STOXECROP 



Herbs, mostly perennial and glabrous. Leaves fleshy. Flowers rarely 

 dioecious, in cymes, often secund. Sepals 4-5, united at base. Petals as many, 

 distinct or somewhat united at base. Stamens twice as many. Carpels dis- 

 tinct or rarely connate below, few to many-seeded. 



Flowers terminal, in unilateral racemes or cymes. 



Petals somewhat united below . . . . . . . 1. S. debile. 



Petals distinct. 



Carpels spreading; flowers yellow. 



Branched from the base, 10-30 cm. high 2. S. Douglasii. 



Caespitose, 5-15 cm. high . . . . . . . 3. S. stenopetalum. 



Carpels erect; flowers purple or purplish . . . . . 4. S. integrifolium. 



Flowers axillary, in equilateral racemes or cymes . . . . 5. S. rhodanthum. 



1. Sedum debile Wats. Bot. King's Exp. 102. 1871. Stems weak, 5-12 cm. 

 high: leaves elliptic to obovate, obtuse, sessile: flowers perfect, secund upon 

 the branches of a forked cyme: calyx-segments ovate-lanceolate: petals 

 yellow, lanceolate-acuminate, about twice as long as the calyx-lobes: follicles 

 erect, tipped by the subulate style. (Gorman ia debilis Brit. Bull. N. Y. Bot. 

 Card. 3: 30. 1903.) Utah and northwestward. 



2. Sedum Douglasii Hook. Fl. Bor. Am. 1: 22X. ls:;o. Much like the 

 following but scarcely caespilose: stems few to several from the base, 1-3 dm. 

 high: leaves flat above, cnrinate beneath: cyme more open, several forked 

 or sometimes much reduced: petals lanceolate-acuminate, shorter than the 

 stamens but surpassing the ovate-acuminate sepals: follicles widely divergent 

 from the slightly united bases. Western Wyoming to Oregon and California. 



3. Sedum stenopetalum Pursh, Fl. Am. Sept. :;:M. 1S14. Glabrous tufted 

 perennial, usually less than 1 dm. high: leaves crowded, and on sterile shoots 

 imbricated, thick-linear, S-14 mm. long: cyme compact; flowers short-pedi- 

 celed : petals lanceolate, acute, nearly as long as the stamens and twice as long 

 as the ovate calyx-lobes: follicles erect, tipped by the long divergent styles. 

 Very common on stony slopes and ridges; from Colorado to Oregon and 

 Washington. 



4. Sedum integrifolium (Raf.) A. Nels. Rootstock fleshy: stems 5-20 cm. 

 high: leaves obovate to oblong-obovate, sessile, 1-2 cm. long, dentate or en- 

 tire: flowers dioecious, dark purple, in a dense cyme: petals oblanceolate or 

 oblong, acute, nearly twice as long as the calyx-lobes, exceeded by the purple 

 filaments: follicles more or less divergent. N. Itliodiola. (S. frigidum Rydb. 

 Bull. Torr. Bot, Club 28: 282. l'.01; ,S. polygamum Rydb. 1. c.; Rhodiola 

 integrifolia Raf. Atl. Journ. 1: 146. 1832.) Alpine; in the Rocky Mountains 

 and westward. 



5. Sedum rhodanthum Gray, Am. Journ. Sci. II. 33: 405. 1862. Glabrous: 

 stems usually many, 1-3 dm. high, very leafy: leaves linear-oblong to oblanceo- 

 late, entire or toothed, 15-25 mm. long: petals rose-color to white, linear- 

 lanceolate, twice as long as the calyx: follicles erect, with spreading tips. 

 (Clementsia rhodantlia Rose, Bull. N. Y. Bot. Gard. 3: 3. 1903.) Along 

 streams in the mountains; throughout our range. 



51. SAXIFRAGACEAE DUMORT. SAXIFRAGE FAMILY 



Herbs with alternate or opposite leaves without true stipules and mostly 

 perfect flowers, solitary or in paniculate or capitate racemes or cymes. Se- 

 pals 4-5, united or nearly distinct. Petals as many, alternate with them, or 

 wanting. Stamens as many or twice as many, inserted on the throat of the 

 calyx. Ovary either free from the calyx or coherent with its tube, 1-3-celled, 



