22 FLORA OF THE UPPER SUSQUEHANNA. 



BALSAMINACE/E. 



IMPATIENS L. 



1. aurea Muhl. Pale Tol-ch-me-not or Jewel Weed. Snap Weed. 

 S.NAi'DRAc.oN. Commoii in damp, shady situations. Found along 

 river banks and in wet, open woods, often in company with the 

 following species. Flowers large, pale yellow. July. Aug. 

 (/. p IX II id a Xutt.) 



I. biflora Walt. Spotted Tolxh-me-xot or Jewel Weed. Snap- 

 dragon. Silver Weed. Very common in wet grounds in the 

 shade or sun. Somewhat more common than the preceding. 

 Flowers similar in shape, smaller, orange, spotted with reddish 

 brown, especially on the lower lip. Spotless flowers sometimes 

 occur. A form of this blossom with- blood-red or pink lower lip 

 is not infrequent. Called Silver Weed from the silvery appear- 

 ance of the leaves when plunged under water. The capsules of 

 this and the preceding species, when mature, burst at the 

 slightest touch, scattering the seeds. Cleistogamous flowers 

 are usually produced before the showy ones. July. Aug. (/. 

 fulva Nutt. ) 



RUTACE>E. 



XANTHOXYLUM L. 



X. Amerkanum Mill. Prkklv Asil Toothache Tree. Some- 

 what rare. Prefers moist soil. Town of Ashland, Chemung 

 county, Lucy. West of Apalachin, Foino. Susquehanna, 

 Graves. Norwich, Coi'ille. Unadilla Forks, Brown. 



PTELEA L. 



P. trifoliata L. Hop-tree. Shrihi-.v Trefoil. Very rare. A 

 single sijccimen is growing (1896) along Riverside Drive in the 

 city of liinghaniton, wliere it is api)arcntly indigenous, Clutc. 



The Chinese Tree of Heaven {Ailanthus) belongs here. It 



is occasionally cultivated for shade and is said to have a ten- 

 dency to become naturalized. 



