Edward L. Greene: Novitates Boreali-Americanae. I. 45 
XII. Novitates Boreali-Americanae. |. 
Auctore Edward L. Greene. 
(Originaldiagnosen.) 
1. Rhus gymnoclada Greene, nov. spec. 
Frutex 2—3-metralis, R. typhinae peraffinis, at omnino glabra. Folia 
2—3 dm longa, rigidiuseula, firmiter adscendentia (nec patentia) crebre 
17-foliolata; foliola superne atrovirentia, inferne glauca, utrinque glaber- 
rima, subcoriacea, oblongo-lanceolata, arcte sessilia, abrupte acuminata, 
levissime serrata vel subintegra, circa 7 cm longa. Thyrsus fructifer 
fusiformis, circa 1 dm longus, acinis atrorubentibus densissime hirsutis 
constans. : 
Low ground, close by the shore of Lake Maxinkucku, Indiana, 
15. Sept. 1906, collected by Mr. H. Walton Clarke. 
A strict ally of R. typhina rather than of R. glabra, both by its 
terete rather than angular branches, and by its densely compacted 
fruit-cluster and long-hirsute drupelets. 
2. Rhus pulvinata Greene, nov. spec. 
Subarborescens, R. typhinae affinis. Rami teretes, nec viilosi nec 
omnino glabri, sed sparsim et obscure pubescentes. Folia patentia, 
ampla, 3— 4 dm longa, 21— 25-foliolata; foliola submembranacea, superne 
atrovirentia, insigniter penninervia, inferne glauca, utrinque glabra, 
oblongo-lanceolata, sessilia, acuminata, serrata, circa 9 cm longa. Thyrsus 
fructifer subpyramidalis, acinis atrorubentibus hirsutissimis densissime 
compactis pulviniformis. 
In the Blue Ridge Mountains near Luray, Virginia, 2. Sept. 1907, 
collected by Mr. and Mrs. E. S. Steele. 
The species is as unmistakably an ally of R. typhina as is the preced- 
ing western species, R. gymnoclada. It is likewise the only Rhus of the 
region where it grows. 
3. Rhus calophylla Greene, nov. spec. 
Etsi rami foliosi tantum adsint, attamen sequentibus characteribus 
facile distinguitur. 
Frutex e grege R. glabrae, ramis annotinis valde angulatis, glabris, 
rufescentibus, glaucis. Folia 2—3 dm longa, adscendentia, creberrime 
25—27-foliolata; foliola superne atrovirentia, nitentia, inferne glaucescentia, 
utrinque glaberrima, subcoriacea, oblongo-lanceolata, argute serrata, 
apice acutissime subfalcato-acuminata, basi subsessilia, inaequi-lateralia. 
Huachuea Mountains, in southeastern Arizona, 26. Aug. 1906, 
Mr. J. C. Blumer. 
The same locality furnished aiso a part of the material of Rhus 
elegantula Greene, Proc. Wash. Acad., VIII, 195*); but that is a species with 
very different foliage, its leaflets neither dark green nor shining above, 
and underneath quite white with bloom, also at base not in the least 
inequilateral. A nearer ally of R. calophylla may be R. nitens Greene, 
. ai cf. Fedde, Rep. IV (1907), 362. 
