180 MISSISSIPPI STATE GEOLOGICAL SURVEY [Bull. 
Linum Floridanum (Planch). Trelease (lL. Virginianum Flori- 
danum Planch.) Southern Yellow Flax. 
Low demp pine barrens, and old fields with sendy soil. Ox- 
ford: Grenada; Bay St. Louis (Allison); Coastal Islands 
(Tracy). May. 
Geol. Surv. Herb. Allison [ferb. 
Linum usitatissium L. Common Flax. 
Oecasional in waste places. Oxford. May-June. 
RUTACEAE. Rue Family. 
ZANTHOXYLUM L. Prickly Ash. 
Zantuo>* ™ clava-herculis L. Southern Prickly Ash. 
in rich camp soil of edges of woodlands in the southern 
coun *ce; Ioecs bluffs at Vicksburg; limestone soils of Clarke 
and Wz) ue counties; Bay St. Louis; Pascagoula. April. 
A p 
Geol. Surv. Herb. Allison Herb. 
PTELEA L. 
Ptelea trifoliata L. Hop Tree. 
Shaded banks of streams. Oxford; Enterprise. (Rare). 
May. 
SIMARUBACEAE. Simbaruba Family. 
AILANTHUS Desf. 
Ailantkus glandulosus Desf. Tree of Heaven. 
(Int. from China) Escaped from cultivation near old:set- 
tlements. June. 
ZYGOPHYLLACEAE. Caltrop, or Bean-Caper Family. 
‘TRIBULUS L. 
Tribulus tere tris L. Ground Bur-Nut. 
Open waste places, and pastures in the southern counties. 
In pastures becoming a veritable nuisance within the last few 
years. Hinds Co.; Warren Co.; (Adv. from Europe.) Sum- 
mer. 
Geol. Surv. Herb. 
