78 



"WEEDS AXD USEFUL PLAXTS. 



1. R. typhi'na, L. Young branches and petioles densely villous 



leaflets in many pairs, acutely serrate, glaucous and somewhat pilose 

 beneath : drupes densely pubescent. 



Typha-like Khl's. Staghorn Sumach. 



Lactescerd. Stem 10-15 or 20 feel Ingh. auti sometimes 4-6 inches in diameter, branched. 

 Leaves composed of 8-15 or 20 pairs of ' lance-oblong leaflets (2-4 inches in length) ; cc-m- 

 mon iMioles 1-2 feet long. Flov:ers yellowish-green, in thyrsoid panicles, — the /ertile 

 panicles smaller and more compact. Ovaries clothed with a long greyish velvety pu- 

 bescence — which on the fruit becomes a bright purple, and sharply acid." 



Woodlands and banks of streams : Canada *o Louisiana. Fl. June. Fr. September - 

 October. 



Ohs. This is the largest and handsomest species of the genus — as seen 

 in the Middle States. The fine purple clusters of fruit, on the fertile 

 plant, render it quite ornamental ; and, if introduced into the yards and 

 public squares of our cities, would present an almost literal exemplifi- 

 cation of the much-admired R (h) us in urhe 1 Its roots, however, are 

 rather troublesome in sending up suckers. 



If Young hranches downy-pubescent. 



2. E,. copalli'na, L. Common petiole winged ; leaflets oblong or ovate- 

 lanceolate, nearly entire. 



Copal Ehts. Dwarf Sumach. 



Jwic€ resinous, ^/er/i 3 -S feet high, branched, iea/a'.? 1 -3 inches long, usually 4-10 

 pairs with a terminal one, subcoriaceous, shining above. Flovxrs yellowish-green in ter- 

 minal thyrsoid panicles. Fi-uil densely pubescent, finally dark purple and acid. 



Dry hills, frequent. Fl July. JV."October. 



Ohs. A very neat species, with very variable leaflets, which are some- 

 times coarsely and unequally serrate. 



Iff Young hranches smooth. 



3. R. gla'bra, L. Branches and petioles glabrous ; leaflets in many 

 pairs, serrate, smooth on both sides, glaucous beneath. 

 Glabrous Ehus. Co&imon or Smooth Sumach. 



Juice copiously milky. Stem 3-8 or 10 feet high, irregularly branching; young 



Fig 56. Smooth Sumach (Rhus glabra), a stamina te flower. 57. A pistillate flower. 58. 

 The sam.e divided, all much enlarged. 



