390 SAXIFRAGACEAE 



3. S. ferruginea (Graham) Small. Plants 1-1.5 dm. tall, pubescent through- 

 out with ultimately reddish hairs; leaves crowded on the short caudex, the blades 

 spatulate to oblanceolate, 1.5-6.5 cm. long, prominently toothed above the 

 middle, copiously pubescent; scapes corymbosely branched above; bracts much 

 smaller than the leaves; sepals ovate, 1.5-2 mm. long, sparingly ciliate; petals 

 3.5-4 mm. long, the 3 upper with lanceolate-cordate blades, the 2 lower with 

 elliptic or spatulate blades. S. ferruginea Graham. Mountains: Alaska 'B.C. 

 Subarctic. Jl-Au. 



21. LEPTARRHENIA R. Br. 



Perennial caulescent herbs, with short leafy caudices. Leaves alternate, 

 with leathery toothed blades narrowed into short petioles. Flowers in thyrsoid- 

 paniculate cymes. Hypanthium flattened. Sepals 5, erect. Corolla regular. 

 Petals white, persistent. Stamens 10; filaments subulate. Ovary slightly 

 inferior; carpels almost distinct. Follicles erect, with slightly spreading tips. 



1. L. pyrolifolia (D. Don.) R. Br. Caudex horizontal, clothed with dried 

 leaf -blades; leaf -blades oblong, 3-9 cm. long, obtuse, serrate, deep green and 

 shining above, pale beneath; floral stalks 1-5 dm. high, with 1 or 2 clasping 

 leaves; sepals ovate, as long as the hypanthium, each with an apical gland and 

 often with some lateral ones; petals narrowly spatulate or oblanceolate, 2-2.5 

 mm. long. Wet places: Alaska Mont. -Wash. Alp. -Subalp. Je-Au. 



23. LEPTASEA Haw. YELLOW SAXIFRAGE, SPOTTED SAXIFRAGE. 



Perennial matted caulescent herbs, with copiously leafy caudices and offsets. 

 Leaves alternate, fleshy or parchment-like; blades entire, ciliate or rarely with 3 

 apical tooth-like lobes, sessile. Flowers solitary or in terminal simple or com- 

 pound cymes. Hypanthium small, much shorter than the calyx. Sepals 5, 

 often spreading or reflexed. Corolla white or yellow, regular. Petals 5, with 

 claws. Stamens 10; filaments subulate (in all ours) or club-shaped. Ovarj' 

 mostly superior, the carpels united to above the middle. Follicles erect, with 

 spreading tips. 



Leaf-blades not spine-tipped at the apex, more or less ciliate. 



Petals suborbicular or oval, 5.5-7 mm. long, each abruptly narrowed into a short 



claw; plant less than 6 cm. high. 1. L. chrysantha. 



Petals elliptic to oblong, 9-13 mm. long, clawless; plant more than 6 cm. high. 



2. L. Hirculus. 

 Leaf-blades spine-tipped ac the apex. 



Petals oblong, oblong-lanceolate, oval, or elliptic; plants without runneis. 

 Leaf-blades entire, with a single spine at the apex. 



Leaf-blades not ciliate, fleshy; flower-stalks bearing larger leaves than the 

 caudices. 3. L. Van-Bruntiae. 



Leaf-blades ciliate, parchment-like; flower-stalks bearing smaller leaves than 

 the caudices. 4. L. austromontana. 



Leaf-blades 3-toothed at the apex, the teeth spine-tipped. 5. L. tricuspidata. 

 Petals broadly obovate; plants with runners producing an offset at the end. 



6. L. flagillaris. 



1. L. chrysantha (A. Gray) Small. Leaves of the caudices 4.5-10 mm. 

 long, thick, spatulate, obtuse, curved, glabrous; flower-stalks 2-5.5 cm. high, 

 sparingly glandular-pubescent, bearing few glabrous leaves; sepals ovate or 

 oblong-ovate, 2-2.5 mm. long, somewhat glandular-ciliate, obtuse; petals golden- 

 yellow. Saxifraga chrysantha A. Gray. High mountains: Colo. -N.M. 

 Alp. Subalp. Jl-Au. 



2. L. Hirculus (L.) Small. Leaves of the caudices 9-41 mm. long; blades 

 flat, elliptic or elliptic-spatulate, glabrous, obtuse, often long-petioled ; flower- 

 stalks 6-30 cm. tall, more or less pubescent, mostly 1-flowered; sepals oblong to 

 oblong-ovate, 3-4 mm. long, copiously ciliate, obtuse, reflexed at maturity; 

 petals yellow. S. Hirculus L. In wet places: Greenl. 'Colo. B.C. Alaska; 

 Eu. Alp. Subalp. Jl-Au. 



3. L. Van-Bruntiae Small. Leaves of the caudices 3.5-8.5 mm. long, the 

 blades very thick, flattish, glabrous or sparingly ciliate, spine-tipped; flower- 

 stalks 4r-9"cm. tall, finely glandular-pubescent; sepals ovate to oblong-ovate, 



