135 



obtuse than in the hist. (Fig. 1(52.) — //. intvrnipla Toir. & Gray, 

 Fl. i. oUO, in part. 



Tcxiibto Arizona and Califoinia, exU-nding also into Mexico. 



A spcfioB very closely related to the last. 



;{. H. Canbyi C. A: R. But. Gazette, xii. 10:5. Umbels 8 to 

 *.)- flowered, <;eiierall\ proliferous; pedicels very short, but distinct: 

 fruit shghtly notched, a line long, and about two lii^es broad, much 

 more flattened than in the precetling forms, dorsal and lateral ribs 

 much more prominent, the former acutish. (Fig. lf)8.) //. 

 Kiiibcllata., \ar ? anibigita (iray, Manual, lUO. 



New Jersey to Maryland. 



Distributed in the older eollcctions as a probable from of //. vnl- 



1.1 HI- is L. 



The three foregoing species, with //. ial(j((ii.s of Europe, form a very 

 natural group, closely resembling each other iii the anatomical details of 

 the fruit. H- vitt{i(irin is most nearly related in external appearance to 

 //. (Utnbiii. but differs in its smaller fruit more or less dotted with oil 

 vesicles. it« less flattened carpels, and less prominent dorsal and lateral 

 ribs, thus intermediating between //. Canbiii and the first two species. 

 There can be no doulitbut that our three species are the North American 

 repirsentatives of K. nihjui is. 



T T I^'riiit }iot notchcii ; iiiCirnu'diati' ribs )iot corky { filiforiii). 



\. H. verticillata Thunberg, Diss. II. IIT). t. 8. Umbels 

 few-flowered, proliferous, forming an interrupted spike; pedicels 

 very short or none: fruit a line long, 1 1^ t(j 'i lines broad, with 

 dorsal and lateral ribs ver\- prominent, tlic former acute. ( Fig. 

 I«4.)- If. iiiterntpta Muhl. Cat. 10. 



Massachusetts to Florida and Texas; (extending into .\rii^ona {Lcmiiivn), 

 Viah { Pal iiifi). and near San Diego, California i Orcall); also in Mexico. 



* * Pritit with pericarp uniformly corky tliickcncii and ribs 

 all jiliforin : leaves not peltate: peduncles much shorter than 

 petioles. 



f Fruit small ( y'^ to 1 " , lines broad)., \^:ithout secondary 

 ribs or reticulations', involucral bracts small or -.(.'anting. 



'"). H. Americana I>. Spec. 'I'-W. .Stems filiform, branching 

 and creeping, often bearing small fusiibrm tubers: leaves thin, 

 round-ienifoi ni, crcnate-lobed and lobes crenate, shining: few- 

 flowercij nnibcjs axillary ■,\\u\ almost sessile: fruit '< to 3^ line 



