P0LYPETAL0U8 EXOGENOUS PLANTS. 197 



* Flowers polygamous^ in a dose terminal panide ; drupe red, hairy ; leaves pinnate. 

 {Not poisonous.) 



R. TYPHINA, L. Branches, yctioles, and drupes villous; 

 leaflets 17-21, lanceolate, acuminate, serrate smooth, pale 

 beneath. — Large shrub. 



R. GLABRA. Smooth and glaucous; leaflets 17-31, 

 oblong-lanceolate, serrate, acuminate, white beneath. Open 

 ^Y00^iS.— Shrub 6°-10° high. 



R. COPALLINA. {Sumach,) Branches and wing-mar- 

 gined 7:>e^ioZe5 tomentose; leaflets 9-12, lanceolate or ovate- 

 lanceolate, acute or obtuse, mostly entire, smooth above, 

 paler and downy beneath ; panicle often large and spread- 

 ing. Margins of fields and open woods. — A shrub or 

 small tree. 



** Flowers diacioris, in loose axillary panides ; drupe whitish, smooth; leaves 

 pinnate and trifoliate. {Poisonous.) 



R. TOXICODENDRON, L. (Poison Oak.) Branches and 

 petioles smooth, leaves trifoliate; leaflets 7-13, ovate or 

 oblong, abruptly acute or acuminate, entire; panicles long- 

 pednncled, narrow, erect. — Shrub, 8°-12° high. 



There are four Tarieties of the Toxicodendron in our 

 State: 



2d. QuercifoUitm. Stems low, erect, leaflets variously 

 lobed. 



3d. Radicans. Stems climbing by rootlets; leaflets 

 toothed or entire, more or less pubescent. 



4th. Trilobate. Found in the northern part of Texas. 



*** Flowers dixciaus, in loose panides ; drupe oblong, smooth, scarlet; nut charta- 

 ceous ; seeds arillate ; leaves pinnate. 



**** Flowers dioecious, in short hracted spikes, appearing with the leaves ; drupe 

 red, hairy ; leaves trifoliate. 



R. AROMATIC A. Stem loAV, smooth ; leaflets ovate, or the 

 terminal one obovate, obtuse, pubescent when young, 

 toothed above the middle-; spikes single or clustered. 



