254 ORDER XXIX. ANACARDIACEJS. 



ing, much larger than the sepals. Stamens 4, alternate with 

 and longer than the petals. Filaments hairy on the inside. 

 Fruit a samara, 2-celled, with one seed in each cell, wing retic- 

 ulated. 



1. P. trifolta'ta, (L.) A 6hrub, branching; the young branches pu- 

 bescent. Leaves ternate. Leaflets sessile, ovate, the terminal one at- 

 tenuate at the base, obscurely crenulate. Flowers in terminal panicles. 

 Petals oval, pubescent, greenish. Flowers with a disagreeable odor. — 

 Greenish. May — June. Middle Car. and Geo. 6 — 8 feet. 



AUanthus glandulosa, or Tree of Heaven, has become a very common and very 

 troublesome tree. It has little or nothing to recommend it, and its unpleasant odor, 

 when in bloom, and the innumerable shoots it sends up in all its neighborhood, are 

 great drawbacks to its cultivation. It belongs to this order. 



Order XXIX.— ANACARDIA'CE^E. R. Br. 



Dioecious or perfect, regular. Sepals generally 5, distinct, 

 or united at the base. Petals of the same number as the sep- 

 als, or none, when present inserted into a glandular disk at 

 the bottom of the calyx, aestivation imbricate. Stamens the 

 same number as the sepals, and opposite them, or twice as many, 

 anthers introrse. Ovary solitary, of 1 — 5 carpels, all but one 

 abortive, 1-celled. Styles usually 3, distinct or united. Stig- 

 mas 3. Fruit usually drupaceous, 1 -seeded. Seed erect or sus- 

 pended, anatropous. Embryo curved. Albumen none. Vines 

 and shrubs, or small trees with a caustic juice. Cotyledons fo- 

 liaceous. 



Genus I.— RHUS. L. 5—3. 

 (From the Greek rous, red, in allusion to its fruit.) 



1. R. typhi'na, (L.) A shrub or small tree, branches very villous. 

 Leaves unequally pinnate, 11 — 31 leaflets, lanceolate-oblong, acuminate, 

 acutely serrate, pubescent beneath. Petioles sometimes 2 — 3 feet 

 long, villous. Flowers often polygamous or dioecious, in dense panicles. 

 Fruit a compressed drupe, covered with an acid, crimson, velvet-like 

 down. Cellular tissue of the wood orange-color, with a strong aromatic 

 odor. Juice resinous, copious. — Greenish-yellow. ^ . June. 15 — 20 

 feet. Middle Georgia, in dense bunches, on rich land. 



Stay-horn Sumach. 



2. R. gla'bra, (L.) A large shrub, with milky juice, glabrous, gener- 

 ally tinged with purple. Leaves pinnate, with 13 — 31 leaflets, lanceo- 

 late oblong, acuminate, smooth, acutely serrate, glaucous beneath. 

 Flowers in terminal, thyreoid panicles, often dioecious. Fruit clothed 

 with crimson acid hairs. — Greenish-yellow. T > • July. Around fields, 

 common. G — 12 feet Smooth Sumach. 



3. R. fumi'i.a, (Mich.) A procumbent shrub, villous. Leaves pinnate, 

 about 11 leaflets, oval or oblong, toothed, pubescent. Flowers in ter- 

 minal panicles, nearly sessile, Fruit clothed with a red silky pubes- 

 eenee. Said to be very poisonous. — T > . July. Upper country. 10 — 

 14 inches. 



