J 18 ANAUAEDIACEiE. rhus. 



cell, ascending, anatropous. Fruit a firm-coriaeeous follicle 

 opening down tiie ventral suture, 1-2-seeded. 



T. spinescens Greene 1. c. Glossopetalon spinescens Gray I.e. 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). 



Order XXV. ANACARDIACE.E. 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 % 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- 

 gamous or polygamo-dkecious 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. (Sumach). An erect shrub 4—12 feet high, 

 smooth ;ind glaucous when young: loaves oddpinnate; leaflets 13 31, 

 petiolulate, oblong to lanceolate, acuminate, acutely serrate 1—3 inches 

 long: Inflorescence terminal, thyreoid, hirsute- sepals broadly subu- 

 late, about a line long: petals oblong, a little longer than the sepals 1 ; 

 drupelets clothed with crimson acid hairs: seeds smooth, about a lino 

 long, in ravines and along streams, eastern Oregon to Brit. Columbia 

 and the south Atlantic States. 



R. toxicodendron L. Sp. 260. Stems erect, 1—3 foci high; leaves 

 trit'oliolate. pubescent; leaflets rhomboid, acuminate, entire or toothed. 

 the lateral ones more or loss oblique: panicles axillary: racemes sub- 

 sessile; flowers mostly dioecious: 1'iT.it white, subglobose, smooth. 

 persistent. Along small streams, eastern Oregon to the Atlantic 

 St a. tes. 



