ANACARDIACEAE. 187 
sylvestris. Shirasawa, 233, pl. 2. R. Toxicodendron (includ- 
ing R. radicans). Blakeslee & Jarvis, 528; Brendel, pl. 3; 
Hitchcock (3), 11, (4), 135, f. 35-36; Schneider, f. 79; Shira- 
sawa, 259, pl. 1. WR. trichocarpa. Shirasawa, 233, pl. 1. R. 
typhina (R. hirta). Blakeslee & Jarvis, 342, 526, pl.; Bose- 
mann, 55; Greene, Ottawa Naturalist. 24:139; Schneider, f. 
79. R. vernicifera. Shirasawa, 232, pl. 1. R. Vernizx. Blakes- 
lee & Jarvis, 333, 334, 528, pl. 
RuHvus. Sumach. 
(Family Anacardiaceae). 
Shrubs, exceptionally climbing 
by aerial roots or becoming small 
open trees; with milky sometimes 
very poisonous sap: deciduous as 
to our species. Twigs round or 
bluntly 3-sided, sometimes fluted, 
slender to very stout: pith rather 
large, roundish, continuous, often 
pink or brown. Buds moderate or 
rather small, solitary, sessile, 
round-ovoid, hairy and indistinct- 
ly scaly or with 3 or 4 evident 
scales, the end-bud often lacking. 
Leaf-scars alternate, round or 
crescent-shaped, or C-shaped and 
encircling the buds, more or less 
raised: bundle-traces rather nu- 
merous in the lower half of the 
round leaf-scars but sometimes in 
3 more or less evident groups or 
3 or 5 to 9 single scars or groups 
in the narrower leaf-scars: stipule-scars lacking. 
The fragrant sumach has a very distinctive type of leaf- 
fall and the generic name Schmaltzia has been used exclu- 
