238 SAXIFRAGACEAE (SAXIFRAGE FAMILY) 



the ovary, 5-cleft. Petals 5, white, entire, withering-persistent. Stamens 5, 

 very short. Ovary 2-celled, with the placentae in the axis. Carpels united 

 to the middle. Seeds numerous. 



1. Sullivantia Hapemannii Coult. Bot. Gaz. 17: 421. 1892. Stems 1-3 dm. 

 high, glandular-pubescent especially above: leaves mostly orbicular-reniform, 

 2-5 cm. in diameter, more or less lobed and the lobes toothed; petioles as long 

 as or longer than the blades: sepals about 2 mm. long, 3-neryed: petals spat- 

 ulate to obovate, somewhat exceeding the sepals: carpels united to the beak, 

 4-5 mm. long. (S. halmicola A. Nels. ex Rydb. N. A. Fl. 22: 122. 1905.) 

 Growing in the crevices of dripping cliffs; Big Horn Mountains and Casper 

 Mountain, Wyoming; also in Colorado. 



7. BOYKINIA Nutt. 



Glandular-pubescent perennial herbs, with simple leafy stems, alternate 

 petioled crenate leaves, and paniculate or corymbose cymes of white flowers. 

 Leaves round-reniform, palmately lobed and incised or toothed; the teeth 

 with callous glandular tips, and the petiole with mostly stipule-like dilations 

 at base. Calyx 5-lobed. Petals entire, ours purple or violet, the base con- 

 tracted into a short claw. Stamens 10. Ovary 2-celled, adnate to the calyx- 

 tube. (Telesonix Raf.) 



Petals long-clawed, blade orbicular, well exserted . . .1. B. Jamesii. 



Petals short-clawed, blade oblong, scarcely exserted . . . 2. B. heucheriformis. 



1. Boykinia Jamesii (Torr.) Engler, Nat. Pfl. 32; 51. 1890. Glandular- 

 puberulent: stem leafy, assurgent, 10-15 cm. high: radical leaves petioled, 

 reniform-cordate, smoothish, crenately toothed or lobed; the cauline few, 

 bract- like above: inflorescence a crowded paniculate cyme, glandular, purplish: 

 calyx-tube campanulate, adnate to the base of the ovary; calyx-lobes trian- 

 gular, acute: petals purple, long-clawed, with well exserted orbicular blade: 

 stamens inserted in the throat of the calyx: styles united. Saxifraga Jamesii. 

 Colorado. 



2. Boykinia heucheriformis (Rydb.) A. Nels. Very near the preceding, 

 caespitose, with a thick scaly caudex: sepals ovate, erect: petals obovate- 

 oblanceolate or oblong-spatulate, dark violet, scarcely longer than the sepals: 

 styles free. (Therophon heucheriforme Rydb. Bull. Torr. Bot. Club 24: 247. 

 1897.) Wyoming, into Montana and Idaho. 



8. SAXIFRAGA L.* SAXIFRAGE 



Either scappse or short-stemmed perennial herbs, with exstipulate alternate 

 (rarely opposite) leaves and small flowers, in simple, panicled, or glomerate 

 cymes (rarely solitary). Calyx 5-lobed or parted, free or more or less adnate 

 to the base of the ovary. Petals 5 (or rarely wanting), entire. Stamens 10. 

 Ovary 2-celled, the placentae in the axis, or the carpels distinct. Styles and 

 tips of the carpels distinct and soon divergent. 



Stems more or less leafy. 



Stem leaves opposite; calyx free 1. S. oppositifolia. 



Stem leaves alternate; calyx adnate to the base of the ovary. 

 Petals yellow. 



Leaves not rosulate at base 2. S. Hirculus. 



Leaves crowded-rosulate at base. 



Stoloniferous . . ' . . . . . . 3. S. flagellaris. 



Without stolons . . . . . . . 4. S. chrysantha. 



Petals white, or nearly so. 



Leaves as broad as they are long, reniform, lobed, or entire. 



Calyx adnate to the ovary, turbinate . . . 5. S. debilis. 



Calyx adnate below only, campanulate . . 6. S. cernua. 



Leaves longer than broad, entire, cleft, or parted. 

 Leaves entire', linear or oblong. 



Calyx cleft nearly to the base . . . . . 7. S. austromontana. 



Calyx-lobes shorter than the tube . . . 8. S. oregonensis. 



* For list of old and new segregates of this genus see Small, N. A. Fl. 22: 129. 1905. 



