m 



(ON I'UIIMTIONS I'KOM IIIK NATloNAI- II KUMAKl HM. 



i\. Ammoselinum butleri (Kiiovlm.) ('. ^s!: \{. Hoi. (in/. 12: '2U4. 1SS7. 



.\l>iiiiii liiilliri l'',ii).'('liii. I'rnc. Am. Ac;iil.21: l">."i. ISS(>. 



U«'.siMiil»liii«:' .1. jioj),/. hilt siiiiilirr iiiid nciiilv <;l!iliroiis; loaf-sojf- 

 iiM'iits narrowly ol)lon<i" or spatuliitc; fi'iiit ovate, aluxit '2 nun. lonjr, 

 witli I'ilts smooth or niiniitt'ly scaln-ous, and corky <'oinniissiii'(' inucli 

 less ])r(»inin('nt. 



Tyix' locality. ■•Tt'xas, in wet oi'onnds near llonston"; collected l)y 

 /A///, no. 244, March. JST'J: type (or dnprnate) in llerlt. (Jray. '^h(^ 

 tyi)e here «,nven is tho Hrst speciin«'n cited. Associated with it in the 

 original description are U> rfrc/io/i, near Dallas. Te.N.. and Hull, r in 

 Indian Territory, south of the ,\rl<ansas. 



In wet yroiMid. Te.xas and adjacent Indian Territoi-y. 



S/iifliiini!' i.iiiiiiiiiiil: 



TicxAs: Near Iluiisto'", //<»// L'44, March L'(t, IST'J; near I larrixhuc^r, ./«.),• li'-J, 

 Miircli 1(), ISTH; near Ihillas, J!, n nhuii :W<, IMaivli, 1S7H aii<l ISSO; Xnillrii, 

 in ISSS; Ilncklcy, I larris ( '(Piiiily, Thnniii^ Marcli L';>, ISSlt; near < ialvcsfon, 

 JSoiliii, Manli .'!, ISIHI; lu-ar IiiiluHtiy, Wnrzldii., May, ISK'); near lldii.stoM, 

 y>'o«c4l7it, May ti, IS'tii. 



23. ZIZIA Koch. Nov. .Vet. ('a<'s. Leop. .\cad. 12; ii'S. 1S24. 



Calyx teeth ])roniin«Mit. Fiuit llatt«'ned laterally, ovat«' to ohlon*^-, 



^•lii))i'ous. Carpel with 

 lilil'orin rihs, Stylojio- 

 dinni wanting: stylos 

 lono-. Oil tulx's la!"<,'"e 

 and solitai'v in the 

 Itioad intervals, 2 on 

 the connnissui'al side. 

 and a small one in each 

 rilt. Seed terete, sul- 

 cate lieneath the oil 

 tubes. 



Smooth perennials (;i 

 to 1» dm. idoh) ol" open 

 pi'airies and upland 

 meadows, with simph' 

 to tei'nately comp(,-;.ih' 

 leaves, no involucre, 

 involuccds of small 

 hraetlets. yidlow tlowers, and centi'al t'i'uit ol" each undxdlet sessile. 



Type species, Siiiijriiliini tnn'riim L. 



A jrroup of :? sju'cieT*. l)elonj^in}»- to the Cnited States and Canada. 



Basjil leaves tcrnati'ly diviilcil. 



Stout jilaiits witli Icallcfs sharply serrate 1. /. mirit 



Sleiiiler plantH with leallets cuarsely serrate ortnotluMl 2. /. Iii'lilni 



Basal loaves siiiiple \\. Z. curditli 



I'Mii. 'J-J.— Ziziii cdnliilii: <i, l>. • Id. 



