127 



wo propobo for it a new genus. Hit' nanit< of wliieli iiidifatcs itb changing 

 liibtoiy. 



4'J. ZIZIA Koch, Umbel. IriU. Sinooth peicmiiiils (1 to 8 

 feet higli), with mostly Thaspium-like leases, no involucre, iiivol- 

 iicels of small bractlcts, yellow Howers, and central fruit of each 

 umbellct sessile.— Flowers in earl} spring-, in open praiiies and 

 Mi)laiul ir.eadows. 



In separating tile species of Zizia from tlie Thiisiiiiun (nimnti gmuit 

 we are indebted to Mr. M. S. Bebb for liis field note.s. His observations 

 concerning Uioir decided differences in liabitat and time of bioomiiig very 

 strongly conllini tlic differences discovered in fruit structure. 



I. Z. aurea Koch, 1. c Radical leaves \ cry lon^j-petioled, 

 all but the uppermost leaves 'J to ;5-ternate; leaflets ovate to lanceo- 

 late, sharply serrate: rays IT) to 2~), stout, 1 to 2 inches long: fruit 

 oblong, about 2 lines \ong. (I' ig. 148.) — Tkaspium aiircii'n^ var. 

 aptcndii Gray, Manual, T.to. Car/i/i/ aiirciun Benth. & Hook. 

 (tcu. Plant, i. SUl. 



Tlirougliout Canada and tlie Atlantit States, extending westward as 

 far as Sasliateliewan and Texas. 



Altliough Tlia-spiuiti aiireniit var. uphiiiin is tlie real synonym of tlie 

 species, botanists will find in tlieir lierbaria many specimens of Z'nla 

 iniri'ii lal)eled Thasjiiimi (iiiniuii aim 7'. Irifolialii m. 



Viu: Bebbii C. A: K. lM)t. (Ja/ette, xii. 1:{S. A more slender 

 mountain form, witii leaflets nu)ie coarsch sei rate or even toothed, 

 the radical leaves sn.aller and more simple: rays 2 to S, slender, 

 2 to 3 inches long: fruit mostly smaller, oval, 1 to l'^' lines long. 

 West Virginia {('aiihi/), \'irgiiiia, N. ("aroiina (Huchhij. Curtiss, 

 ('onbi/. Mi'ehdii, Porlir). and (ieoigia ( I'f/.sr//). 



2. Z. COrdata Koch, 1. c. Radical lca\es mostly loiig- 

 petioled, cordate or e\en rt)under, cienatel\- toothed, ver\ rarelv 

 lobed or divided; stem-Iea\es simply leniale or cpiinate, the leaf- 

 lets ovate to lanceolate, serrate, incised, or e\en parted: fruit ovate, 

 ll4 lines long: seed-section larger than the preceding. (Fig. 14U.) 

 — VViasp/um /r//'o//a/uw, \ ar. aptcriiiii (Jiav, Manual, 195. 

 Car/nil rorJatum P'.enth. iV Ho(A. ( Jen. I'lanf. i. S'.tl. 



Same range as last and extending to Oregon, 



As in the lust species, herbarium specimens of Ziz'm lunthdi, will be 

 fouiirl labeled almost anything nndi-r tiie TluiMiiiKin nun tun section. 



