Flora of the Palousc Regio?i i r 3 



B, toxicodendron L. Low shrubs, weak or decumbent, .5-1 m. high: 

 leaflets 3, broadly ovate, acuminate, entire, or with a few tooth-like lobes, 

 glabrous or pubescent beneath, 5-10 cm. long, the lateral ones with shorter 

 stalks; petioles longer than the leaflets: panicles shorter than the petioles: 

 flowers green: drupes globose, 4-6 mm. in diameter, shiny, whitish, longitu- 

 dinally ribbed; stone striate. Along Snake River: very poisonous. Our 

 form seldom or never climbs and has been considered a distinct species, R. 

 rydbergii Small. 



Family 44. CELASTRACEAE. 



Shrubs, often climbing: leaves simple and undivided, alternate 

 or opposite; stipules none or small: flowers regular, usually per- 

 fect, small; pedicels commonly jointed: calyx 4-5-lobed, the lobes 

 imbricated: petals 4-5, spreading: stamens 4-5, on the calyx-tube, 

 alternate with the petals: ovary sessile, free from or confluent with 

 the calyx-tube: fruit a somewhat fleshy dehiscent pod; seeds with 

 arils; endosperm fleshy. 



1S2. PACHYSTIMA. 



Low evergreen shrubs: leaves opposite, smooth, serrulate, cor- 

 iaceous: flowers perfect, very small, green, solitary or fascicled in 

 the axils: calyx-lobes 4, broad: petals 4: stamens 4, on the edge 

 of the calyx-tube: style very short: ovary free: pod small, oblong, 

 2-celled; seeds 1 or 2, enclosed in a white membranous many-cleft 

 aril. 



P. myrsinites Raf. Evergreen glabrous shrub, much branched, 30-60 

 cm. high: leaves oblong, lanceolate or obovate, acute or obtuse, cuneate at 

 base, serrate or almost entire, nearly sessile, 1-3 cm. long, the margin some- 

 what revolute: flowers yellowish or purplish, 3 mm. broad: peduncles and 

 pedicels short, 2-3 mm. long: capsule oblong, acute, 5-6 mm. long. In 

 woods, Thatuna Hills. 



Family 45. SAPIXDACEAE. 



Trees or shrubs: leaves simple or compound, opposite, with- 

 out stipules (in ours): flowers polygamous or dioecious, reg- 

 ular (in ours): sepals 4-5: petals often none (in ours): stamens 

 5-10, inserted on the fleshy calyx-tube: ovary 2-celled 

 and lobed (in ours), with 2 ovules in each cell (in ours): endos- 

 perm none. 



Leaves opposite, palmatelv-lobed. [83. acf.r. 



Leaves alternate, entire. 1S4. olossoi'KTai.ox. 



[83. ACER. 



Trees or shrubs: leaves opposite, palmately-lobed, without 

 stipules: flowers small, polygamo-dioecious, in clusters: calyx 

 colored, usually 5-lobed: petals 5 and equal or none: stamens 3-12: 



