88 Flora of the Palouse Region 



A. calycinum L. Annual, 10-30 cm. high, stellate-pubescent throughout, 

 usually branched from the base: leaves entire, spatulate, 1-2 cm. long: flow- 

 ers in racemes, 5-15 cm. long: petals pale yellow, cuneate, scarcely exceed- 

 ing the sepals: pods orbicular, margined, notched at apex, minutely pubes- 

 cent, 3 mm. broad, on spreading pedicels. Introduced and becoming com- 

 mon. 



Family 34. CRASSULACEAE. 



Succulent or fleshy plants, mostly herbs: stipules none: flowers 

 regular and symmetrical, in cymes or rarely solitary: calyx hypo- 

 gynous, 2-12-parted: petals of the same number as the calyx-lobes, 

 distinct or slightly united at the base, rarely wanting: stamens of 

 the same number as the petals: pistils of the same number as the 

 sepals, distinct or united below; ovules numerous: follicles mem- 

 branous or coriaceous, 1 -celled; seeds minute; endosperm flesh}-. 



143. SEDUM. 



Fleshy mostly glabrous herbs, erect or decumbent: leaves alter- 

 nate, entire or dentate, fleshy: flowers perfect or dioecious, in ter- 

 minal often one-sided cymes: calyx 4-5-lobed: petals 4-5, distinct: 

 stamens 8-10, perigynous, the alternate ones usually attached to 

 the petals: pistils 4-5, distinct or united at the base; ovules num- 

 erous: follicles few-many-seeded. 



Leaves becoming scarious. S. dougi.asii. 



Leaves green, not becoming scarious. S. diyaricaTum. 



S. douglasii Hook. Stems erect, branched at base, from a stout root- 

 stock, 15-20 cm. high: leaves lanceolate, attenuate to the apex, 6-12 mm. 

 long, becoming white-scarious when old: flowers yellow, sessile, in an open 

 cyme: petals lanceolate, acuminate, 5-6 mm. long, twice as long as the sta- 

 mens: follicles diverging from their united bases: axils of the cauline leaves 

 commonly bearing short deciduous leafy branches by which the plant is 

 propagated. Basalt rocks, common. 



S. divaricatum Wats. Annual: stems mostly single, stout, erect: radical 

 leaves spatulate; cauline green, lanceolate, acute, 5-10 mm. long: flowers as 

 in the preceding, the cymes larger: no propagating branches in the cauline 

 leaf axils. Bluffs of Snake River. 



Family 36. SAXIFRAGACEAE. 



Herbs or shrubs: leaves alternate or opposite; stipules usually 

 none: flowers perfect or polygamo-dioecious: calyx usually 5-lobed, 

 free or adherent to the ovary: petals usually 4 or 5, perigynous, 

 rarely none: stamens usually definite in number and not more than 

 twice the number of the calyx-lobes: pistil formed by the partial 

 or complete union of 2-5 carpels; placentae axile or parietal: seeds 

 usually numerous; endosperm present; embryo small, 



