124 CRASSULACEAE. 



Cleome lutea Hook. Glabrous or nearly so, 1-2 m. tall; leaves 5-foliolate; 

 leaflets entire, lanceolate to oblong; racemes dense; flowers yellow; stipe of 

 pod usually shorter than the pedicel. Abundant along streams in the sage- 

 brush region. Occasional in our limits. 



Cleome serrulata Pursh. Leaves 3-foliolate; leaflets entire or minutely 

 serrulate; flowers rose-purple. Pomeroy. Spreading along the railways 

 from the sagebrush region. 



Family 43. CRASSULACEAE. STONECROP FAMILY. 



Succulent or fleshy plants, mostly herbs; stipules none; 

 flowers regular and symmetrical, in cymes or rarely solitary; 

 calyx hypogynous, mostly 4-5-parted or lobed ; petals of the same 

 number as the calyx-lobes, distinct or slightly united at the base, 

 rarely wanting; stamens of the same number or twice as many 

 as the petals; carpels of the same number as the sepals, distinct 

 or united below; ovules numerous; follicles 1 -celled; seeds 

 minute; endosperm fleshy. 



176. SEDUM' STONECROP. 



Fleshy mostly glabrous herbs, erect or decumbent; leaves 

 alternate, entire or dentate, fleshy; flowers perfect, in terminal 

 often 1-sided cymes; calyx 4-5-lobed or parted; petals 4-5, 

 distinct or slightly united; stamens 8-10, perigynous, the alter- 

 nate ones usually attached to the petals; carpels 4-5, distinct or 

 united at the base; ovules numerous; follicles few-many-seeded. 



Leaves becoming scarious; carpels divergent. S. douglasii. 

 Leaves not becoming scarious. 



Biennial; carpels widely divergent. S. leibergii. 



Perennial; carpels erect. S. stenopetalum. 



Sedum douglasii Hook. Stems erect, branched at base, from a stout 

 rootstock, 15-20 cm. high; leaves lanceolate, attenuate at the apex, 6-12 mm. 

 long, becoming white-scarious when old; axils of the cauline leaves commonly 

 bearing short deciduous leafy branches by which the plant is propagated; 

 flowers yellow, sessile, in an open cyme; petals lanceolate, acuminate, 5-6 mm. 

 long, longer than the stamens; follicles diverging from their united bases. 

 Basalt rocks and gravelly soil, common. 



Sedum leibergii Britt. Biennial; stems mostly single, stout, erect; 

 radical leaves spatulate; cauline green, lanceolate, acute, 5-10 mm. long; 

 without propagating branches in the cauline leaf axils; flowers as in 5. douglasii, 

 the cymes larger. On rock ledges, common. 



Sedum stenopetalum Pursh. Perennial from branched rootstocks, glabrous 

 or minutely puberulent, green; stems erect, 6-15 cm. high; leaves lanceolate, 

 broadest at base, acute, sessile, 4-8 mm. long; flowers bright yellow, nearly 

 sessile, in a close cyme; petals lanceolate, acuminate, twice as long as the sepals; 

 carpels 4 mm. long, divergent only at the tips. On cliffs along the Clearwater 

 River, Idaho, and in the Blue Mountains. 



