118 ANACARDIACE, RHUS. 
cell, ascending, anatropous. Fruit a firm-coriaceous follicle 
opening down the ventral suture, 1-2-seeded. 
F. spinescens Greene 1. c.  Glossopetalon spinescens Gray 1. c. A 
smooth rigidly branched shrub 2—3 feet high: leaves oblong to spatu- 
late, narrowed below on slender pedicels 2—4 lines long, acute or ob- 
tuse: flowers on slender pedicels 2—4 lines long: lobes of the calyx 
oblong, a line or more long: petals white, 4—5 lines long, spatulate, 
attenuate below to a short slender claw: stigma nearly sessile, 2- 
lobed; ovary acute; fruit not seen. Bluffs of Snake river (Cusick). 
OrpER XXV. ANACARDIACEZ. Lindl. Nat. Syst. ed. 1. 
Shrubs or trees with resinous or milky juice, simple or com- 
pound leaves without stipules, and small flowers in axillary or 
terminal panicles. Flowers usually regular, perfect, dioecious 
or polygamous. Sepals usually 5, distinct or more or less uni- 
ted, mostly persistent. Petals of the same number as the sep- 
als, or wanting, inserted into the disk which lines the bottom 
of the calyx. Stamens as many as sepals, or twice as many, or 
more, sometimes part of them sterile; filaments distinct. some- - 
times alternately shorter, inserted with the petals. Ovary sol- 
itary, free, or rarely adhering to the calyx, 1-celled, or with 1 
or 2 abortive cells;ovule solitary, on a funiculus which rises 
from the base of the cell. Styles 3, rarely 4, distinct or com- 
bined. Fruit a 1-seeded indehiscent drupelet. Seed erect or 
suspended, anatropous, without albumen. <A large order, 
represented here only by the genus | 
RHUS L. Gen. n. 361. 
Shrubs or small trees with alternate leaves and small poly- 
gumous or polygamo-div-cious flowers in axillary and terminal 
bracteate racemes or panicles. Calyx small, 4-6-parted, persist- 
ent, imbricated in the bud. Petals 4-6, imbricated in the bud. 
Stamens as many or twice as many as petals, with subulate fila- 
ments, inserted under the edge of the disk. Fruit a dry drupe- 
let. Seed pendulous upon a slender seed-stalk arising from the 
base of the cell. 
* Flowers polygamous or dioecious; panicled, developed with or 
after the leaves. 
R. glabra L. Sp. i, 265. \(Sumacu). An erect shrub 4—12 feet high, © 
smooth and glaucous when young: leaves oddpinnate; leaflets 13—31, 
petiolulate, oblong to lanceolate, acuminate, acutely serrate 1—3 inches 
long: inflorescence terminal, thyrsoid, hirsute: sepals broadly subu- 
late, about a line long: petals oblong, a little longer than the sepals: 
drupelets clothed with crimson acid hairs: seeds smooth, about a line 
long. In ravines and along streams, eastern Oregon to Brit. Columbia 
and the south Atlantic States. 
R. toxicodendron L. Sp. 266. Stems erect, 1—3 feet high; leaves 
trifoliolate, pubescent; leaflets rhomboid, acuminate, entire or toothed, 
the lateral ones more or less oblique: panicles axillary; racemes sub- 
sessile; flowers mostly dioecious: fruit white, subglobose, smooth, 
gach ipa Along small streams, eastern Oregon to the Atlantic 
ates. 
