»'(H'I/I'KU AND KOSK NOUTII AMKKKAN UiMHKLLIFKKAK. 



H9 



stn'iij;(lHMiinjj^t'«'lls. Styles very short. Oil tulx'ssolitury in tin* iiitcr- 

 viils, 2 on tlu' coiiimissunil siclc; iill rather small and not close to the 

 seed eavity. Seed dorsally tiattetied, with j)lane face. 



Low dilluse ajinuals, with ternately divided leaves, the small ulti- 

 mate se^J^ments linear to spatulate, involucre and involucolsol' t'utiro or 

 dissected hraets, and white flowers in 

 >niall sessil(> <»!• short pedunculate 

 unequal umbels. 



Type species. J. j>op) 1 'W & (1. 



A ecnu.s oV two species, lar<;ely 

 icstrict«'d to Texas, hut extendin<f 

 into western Kansas, Ari/ojia, and 

 Mexico. 



Flu. 21.— Aniiiiosc'limiiii iKipci: 

 o, X X; ((, ^ 10. 



I>ciii;:li scalinmij; fruit (iviilc-nhluiitr, I tn ") 

 IMMI. V\\\\i. 



Low, 1 dm. liijjtli I. A. i>i>/i)i. 



TalU'r, 2 to ;J ilin. Iiif^li.. 2. A. ijiijiuilnnn. 

 Niaily glabrous; fniit ovate, 2 iinii. loiifjr .'i. .1 Inillt'H, 



1. Ammoselinum popei 'I'orr. & Gray. l*acif. R. Re]). 2': H'u). 1855. 



Fkj. 21. 

 Aiilinii {Kiixi (iruy, I'mc. .Vm. Acad. 7: .'Uli. lS(i7. 

 .Miout I dm. hi»ih. with stem-anj^les, rtiys, pedicels, and rilis of fruit 

 iituyh scabrous; leaf sej^'ments narrowly linear; fruit ovate-oblonjf, 

 4 to ."> mm. lon^^ with thick corky coMunissure. 



Ty])e locidity. "sandy .soil. Llano Kstacado and head waters of the 

 Coloi-iido;"' collected ])y I>lfrii<l()ff(i-\ type in Herb. (Jniy. 



Ill sandy soil, western Kansas to Texas, and extendinj^- into Mexico. 



.V//( ciini nx I'.nitilhivd: 



K w.sAs: South wcHtorn Kansa.", I'laiik. 



Tkx as; Tom (Jreen County, Tinrdi/ 1H8, Muy. 1SP.0; Hrowii County, Rncrrhon 

 1402, April, 1SS2; San Dii'Ko, Mitrij li. Croft 81, in LSH4; Nueces County, 

 llill.r 1474, March L'l, 1S()4. 



'1. Ammoselinum giganteum C. cSc R., sp. nov. 



.Much branched thro /hout iind spreadinj^, the branches 2 to H (hn. 

 I<•|l},^ :in«,ded iind rouj^hen«'d; fruit ovate, 5 mui. \o\\g, with rather thiu 

 commissure, densely and sh!irj)ly scalirous. 



ry|)e locality, mesas near Phcenix, ,\ri/.; collected by ('. (i. Prhu/U,, 

 no. 2S, ,luru» 17, 1882; type in Herb. (Jniy. 



Only known from tyj)e locality. 



Sjii i-iiiirim cnnnineii: 



.\|{I7,ona: Type ^jpecinuMiH aj^ cited under tyiw locality. 

 Here perhajjs helonti specimens collected in the dest^rt around Maricopa, Ariz., by 

 I 11. Dewey, in June, 1894, except that the fruit is narrowly oblonj; and smaller. 

 Tiir material is rather fragmentary and should be collected in (luantity by coUectora 

 ii; that region. 



