Rhus glabra ab Edward L. Greene revisa. 357 
vato-lingulata, late dentata, basin versus incisa — sublaciniata, vel 
lingulata — anguste lanceolata, pinnatipartita, lobo terminali ovato basi 
sagittata vel sagittato marginibus repandis laciniisque anguste vel rarius 
latius triangularibus — subsemilunaribus, integerrimis — paucidentatis, 
valde reversis, contiguis vel dentibus minoribus separatis; scapi erecti 
vel sigmoideo-adscendentes, virides vel in parte superiore saltem obscure 
rubri, araneo-villosi — subglabri: capitula vulgo majora, obseure lutea, 
sat angustiflora, plena vel ligulis sat distantibus saepe longe radiantibus: 
antherae polliniferae ; squamae involucelli anguste subulatae, uncinatae, 
patentes vel recurvae, saepe coloratae; achenia obscure vel laetius 
olivacea, costata, rugosa, apice muricata, 3—3,5 mm longa, 1 mm lata, 
appendice indistincta — brevi, 0,5 mm longa. — Colore obseuro 
ligulisque distantibus noc non squamis involucelli uncinatis facile di- 
gnotum. 
In locis calcatis nudis vel graminosis Finlandiae australis 
hactenus lectum, cum T. laevigato (Willd.) var. reflexo Brenn. in loco supra 
citato commixtum. 
XCIV. Rhus glabra ab Edward L. Greene revisa et 
in species novas atque affines divisa. 
(Ex: Proc. Washington Ac. Si., VIII [1906], pp. 167—196.) 
(Schluss.) 
13. Rhus Sandbergii E. L. Greene, l. c., p. 187. 
Rhus glabra var. Sandbergi Vasey € Holzinger in Herbarium Field 
Museum. 
Very dwarf, flowering and fruiting freely at 1,5—2 dm high; bran- 
ches of the season 4—5 em long, angular, rusty-tomentulose and with 
also a few hirsute hairs, older branches glabrate: leaves small, barely 
1,5 dm long, the slender rachis pubescent on all sides; leaflets 11—13, 
sessile, oblong-lanceolate, 4—6 cm long, appressed-serrate, the serratures 
15—17 on each margin, apex subulate-acuminate, both faces nearly or 
quite glabrous, the upper deep green, the lower glaucous; panicle very 
small, seldom exceeding 5 cm long, subpyramidal, its branches densely 
and subtomentosely hirsute: drupelets of the ordinary size and color. 
Said to grow in crevices of rocks, near the head of Lake Superior 
at Thompson, Minnesota, where it was collected in flower in July. and 
in fruit in August, 1891, by J. H. Sandberg, no. 401 and 921. 
14. Rhus borealis E. L. Greene, |. c., p. 188. 
Shrub evidently large but not stout, at least as to the branches, 
these smooth, glabrous, glaucous; leaves ample as to breadth, but not 
greatly elongated, 3 dm long, the usual hairy line of the rachis quite 
hirsute, but other parts of the rachis, and also the midvein of the leaflets 
