286 Karl M. Wiegand and Arthur J. Eames 



2. Erodium L'Her. 

 1. E. cicutarium (L.) L'Her. Storksbill. 



A weed in waste places ; rare. Apr. 15-May. 



Occurring since 1917 between Roberts Hall and the Home Economics Building, 

 C. U. campus. 



Distributed over most of N. A. except in the northern part. Adventive from Eu. 



70. RUTACEAE (Rue Family) 

 1. Zanthoxylum L. 

 1. Z. americanum Mill. Northern Prickly Ash. 



Thickets, in rich alluvial soils and often in drier calcareous soils ; frequent. May. 



Shores of Summit Marsh ; Inlet, below Newfield station, abundant ; Negundo 

 Woods (D.) ; Renwick woods; Renwick slope; "occasional throughout the Neguaena 

 valley and along the low points on the lake-shore. Also in Lansing and Dryden" 

 (D.) ; n. of the Republic Inn, Freeville ; Mud Creek, Freeville; Cortland marl ponds; 

 n. of Esty ; Salmon Creek valley, abundant ; Montezuma Marshes ; near Lowery 

 Ponds ; near Howland Island, abundant ; along Black Brook, Tyre ; and elsewhere. 



W. Que. to Minn., southw. to N. J., Ga., Ky., Mo., and e. Kans. ; rare or absent 

 on the Coastal Plain. 



71. SIMARUBACEAE (Quassia Family) 



1. Ailanthus Desf. 



1. A. altissima (Mill.) Swingle. (See Journ. Wash. Acad. Sci. 6:490. 1916. A. 

 glandulosa Desf.) Tree of Heaven. Ailanthus. 



Thickets, roadsides, and ravine banks, in various soils ; frequent. July. 



Escaped from cultivation: South Hill (D. !) ; streets of Ithaca; "north of Glen 

 Pond. Cascadilla Cr., below the bridge" (D.\) ; circus common, s. of Percy Field 

 (D. !) ; near McKinneys (D.) ; and elsewhere. 



Widely planted and escaped. Native of Asia. 



72. POLYGALACEAE (Milkwort Family) 

 1. Polygala (Tourn.) L. 



a. Flowers large, 18 mm. long, few, loosely arranged, purple ; leaves ovate. 



1. P. paucifolia 

 a. Flowers small, 5 mm. long or less, in heads or spikes ; leaves narrow. 



b. Plant perennial, from stout roots ; flowers white ; leaves alternate. 



2. P. Senega 

 b. Plant annual. 



c. Flowers purple or greenish purple, in globular or broadly oblong heads ; leaves 



alternate. 3. P. sanguinea 



c. Flowers white or greenish white, rarely purple-tinged, in slender spikes. 

 d. Spikes dense; petals greenish white or tinged with dull purple; lower 



leaves verticillate. 4. P. verticillata 



d. Spikes less dense ; petals white, often tinged with pink ; lower leaves 

 usually scattered. 4a. P. v., var. ambigua 



1. P. paucifolia Willd. Fringed Polygala. Flowering Wintergreen. 



Dry woods and banks, in neutral or subacid, sandy or gravelly, soils, especially 

 under evergreens ; frequent. May. 



