131 



:^'l. CRVP roT.i:xiA dc. Mc-.u. riuwi. j-i. (;i;.i.r.,i:s 



perennials, with Ihin iMbliolatc leaves, no in\ oliicie, iii\ oliieels of 

 minute biactlets or none, and white llowers. 



B(Mithiim .V: Hooker eonsidt-r tliis j,'»miuk to bo too iirai I'iniiuiulht, but 

 the fruit charactors are very different. In ('ruiitnttniiti the ciiriteliarv wnli 

 is composed of two distinct layers, the outer beiny almost nuide up of tlie 

 very broad bundles of strenf^theniiiK cells, the iinier composed of a sin^h' 

 layer of large parenchyma <ells in \Yhicli the oil-tubes always occur. Ir, 

 I'impiueUit the bundles of strengtheniuK cells aic veiy small and 

 ■widely separated, and there is no such inner layer. 



1. C. Canadensis DC. 1. e. One to three feet hii^h: leaf- 

 lets large, ovate, 2 to i inches long, pointed, douhly serrate, often 

 lobcd: unibcis irregidar and nnecinally few -rayed; pedicels very 

 unec[ual, from a line or two to an inch long: fiuit '1 to 8 lir.es long, 

 often becoming curved. (Fig. ir)3. ) 



Canada to Minnesota, and south to N. Carolina, (teorj^ia, ^fississippi, 

 and Texas. Fl. June to September. 



:rS. LEPTOCALLIS Xntl. in DC. Piodr. iv. 107.— Very 

 slender smooth branching annuals, with finely dissected leaycs 

 having fihform or linear .segments, and smrdl white flowers in in- 

 volucellate very unequally few-rayed pedunculate umbels. 



This genus is referred to Apium by Beutham A- Hooker, but the dif- 

 ferences in its fiuit structure are so great that only similarity in habit 

 eould have suggested su( h an association. 



1. L. echinatUS Nutt. 1. c, A span to a foot high: fruit 

 with rather narrow commissure, echinate \yith spreading hooked 

 bristles, about ^ line long; ribs obsolete. (Fig. \M.) — Apiicn 

 vcJihiatKin Benth. A: Hook. Gen. Plant, i. NS8. 



Ahibama to Arkansas, westward to Texas (HalL Reiu-iu-him. J//.v.s 

 Tco/Zj, New Mexico (Wrifihl, Greene), Arizona [I'riimJe. /'«///.s/( I. and S. 

 California ( ir. F. I'drish). Fl. April and May. 



2. L. divaricatus DC. Mem. Umbel. 81). t. 11). One to two 

 feet high, with spreading branches: umbels more diffuse than in 

 the last and usually with fewer rays: fruit with broader commis- 

 sure, tuberculate, i<, line long; ribs somewh.-.t prominent. (Fig. 

 155.) — Apf/i»i d'lvaricatiini Hentbi. <!v: Hook. 1. c. 



North Carolina to Florida, and westward to Kansas {Ot/nl, ,), Arkansas 

 (.V«//«//), Indian Territory {Falinrr), and Texas; also rare on ballast near 

 Philadelphia (Parkers. Fl. April. 



