426 EUPHORBIACEAE 



i. T. corollata (L.) Kl. & Garcke {Euphorbia corollata L.). In 

 dry soil: Mass. and Ont. to Minn, and Kan., south to Fla. 

 and Tex. 



Conn. Rare, and only as an adventive weed. 

 N. Y. Unknown on L. I.; reported but not definitely known now 



on S. I., otherwise unknown. 

 N. J. Rare and local in Hunterdon, Somerset and Mercer counties, 



increasing and common southward, but not in the pine-barrens. 

 Pa. Northampton, Bucks, Delaware and Chester counties. 



Tertiary, unknown on Beacon Hill, rare elsewhere: Cretaceous, 

 common: Older Formations, rare and scattered in locally sandy 

 places. 158-220 days. About sea level. 



2. T. Ipecacuanhae (L.) Small (Euphorbia Ipecacuanhae L.). In 

 dry sandy soil, mostly near the coast: Conn, to Fla., also 

 in southern Ind. 



Common throughout most of the coastal part of our range, 

 especially in the pine-barrens. Always in sand, but not collected 

 from the sea-beaches, and known in Conn, only from an old speci- 

 men reported to be collected at East Windsor. 



T. arundelana (BartlettJ Small has been reported from Swedesboro, Gloucester Co., 

 N.J. 



8. Tithymalus [Tourn.] Adans. 



Leaves mainly opposite; capsules 10 mm. wide or more. 1. T. Lathyris. 



Leaves alternate; capsules less than 10 mm. wide. 



Leaves serrulate. 2. T. Helioscopia. 



Leaves entire. 



Annual or biennial; seeds pitted. 3. T. Peplus. 



Perennial; seeds smooth. 



Glands reniform, not horned. 4. T. Darlingtonii. 



Glands crescent-shaped, horned. 



Stem-leaves 4-12 mm. wide. 5. T. Esula. 



Stem-leaves 0.5-3 mm - wide. 6. T. Cyparissias. 



1. T. Lathyris (L.) Hill (Euphorbia Lathyrish.). In waste places: 



Conn, to N. Car. Also in Cal. Native of Europe. 

 Rare as an adventive weed. 



2. T. Helioscopia (L.) Hill (E. Helioscopia L.). In waste places: 



Ont. to N. H., N. Y. and Ohio. Native of Europe. 



In waste places near the City of New York and at Camden, N. J. 



3. T. Peplus (L.) Hill. (E. Peplus L.). In waste places: N. Y. 



to N. J. and Pa. Native of Europe. 

 Rare as a weed near the larger cities. 



