618 UMBELLIP'ERAE 



Locs. — Sierra Nevada: Folsimi, K. Urandegcc ; ('(niianclio. Amador Co., Hansen; betw. 

 Vallov Rprs. and Moki'lumnc Hill, /•'. K. Jilai.sdcU. Coast Kanjjcs: Aldor Sprs., w. Glenn Co., 

 UfUrr 11,445; llcuch's Sprs., n. Lake Co., Jrpson 9(120; Vaca Mts., Jcpson 14,'207 ; Conn Valley, 

 Napa Rnnpe, ./< ;).\(>>i 14,2ns ; Mt. Dialdo, Rnltan ; Mt. Tanialpais, A'. lirandrfirr ; Eva sta., Santa 

 Cruz Mts., Jipson 14,L'(tti; Pajaro Hills, n. Monterey Co., Cliandhr 420; Milpitas Hancli, Santa 

 Lucia Mts., Kastwood : Alcalde, Juintwuod ; Los Oaos Valley, San Luis Obispo Co., Condit. S. Cal.: 

 Sycamore Canon, Santa Inez Mts., Jcpson 91().'i ; Ilennifjer Flats, San Gabriel Mts., Ptirsnn 133; 

 Garvanza, Jiraunlon ; San Bernardino, Parish ; Santa Catalina lal., Gamhrl; Elsinore, McClatchir ; 

 Pala Mission, Jcpson 8497; Wagon Wasli near Sentenac Canon, e. San Diego Co., Jcpson 8770; 

 Cajon Hills, w. San Diego Co., Dunn. 



Refs. — AiM.^STRTTM ANGUSTiFOiJUM Nutt. ; T. & G. Fl. 1:644 (1840), type loc. San Diego, 

 XuttaU; Jepson, Fl. W. Mid. Cal. 349 (1901), ed. 2, 294 (1911), Man. 704, fig. 684 (1925). 



7. AMMOSELINUM T. & G. 



Low annuals. Leaves ternately divided into small segments. Umbels com- 

 pound, with unequal rays, small, sessile or shortly peduneled. Involucre and in- 

 volucels present. Flowers white. Calyx-teeth obsolete. Fruit ovate to ovate- 

 oblonpr. compressed laterally. Ribs prominent, e(iual, more or less scabrous, the 

 laterals of the companion carpels clo.sely approximate, as if forminjr a single broad 

 rib. Styles short. Oil-tubes solitary in the intervals, 2 on the commissure. — Species 

 3, southwestern United States. (Greek ammos, sand, and Selinum, an Old World 

 genus of Umbellif erae, the name derived from selinon, the Greek word for parsley. ) 



1. A. gig-anteum C. & R. Plants 5 to 8 inches high; stems leafy; herbage gla- 

 brous or the upper portion of the stems and the margins of the upper leaves sca- 

 berulous; leaves 1 to 2 inches long, the blades 2 to 3 times ternately dissected into 

 linear segments 1 to 3 lines long; peduncles 1 to 2% inches long; rays 1 to 5 lines 

 long; fruits li/4 to 2i/2 lines long, densely scabrous with short-lanceolate or short- 

 subulate processes. 



Ileav}' soil of desert flats, 500 feet : Chuckwalla Valley, Colorado Desert. East 

 to Arizona. Apr. 



Tax. note. — This species has been collected in California only at Ilayfields (Mun~ 4' Kech 

 4930). Further collections arc desirable, more especially specimens in ripe fruit. The lanceolate 

 spines characteristic of the ovary in the flowering or half -grown stages in the specimens from 

 Hayfields seem essentially like those of the mature fruits in the type specimens of A. giganteum 

 gathered by Pringle in Arizona. They are denser, but after the ovary grows to maturity and 

 becomes twice as large, the spines would, inevitably we should think, be spaced about as in the 

 type of A. giganteum. 



Refs. — AMMOSELINUM GIGANTEUM C. & E. Contrib. U. S. Nat. Herb. 7:89 (1900), type loe. 

 PhoenLx, Ariz., Pringle 28. A. occidcntale M. & J. Bull. Torr. Club 52:224 (1925), type loe. 

 Hayfields, Chuckwalla Valley, Colorado Desert, Munz 4' J^cck 4930. 



8. AMMI L. 



Erect branching glabrous biennials with slightly fusiform roots and dissected 

 decompound leaves. Flowers white, in compound umbels. Bracts parted into 

 filiform segments, reflexed. Bractlets lanceolate, acuminate, spreading or reflexed. 

 Calyx-teeth obsolete. Fruit ovoid, very slightly flattened laterally. Ribs filiform. 

 Oil-tubes solitary in the intervals and 2 on the commissure. — Species 7, Europe, 

 Asia and Africa. (Greek name of an umbelliferous plant.) 



Leaf -segments obovate to oblong or oblanceolate, serrate or laciniate; fruiting rays spreading 



1. A. ma jus. 

 Leaf -segments filiform or narrowly linear, entire; fruiting rays closely contracted. ...2. A. visnaga. 



1. A. majus L. Bishop's Weed. Stem slender, branching above, I14 to 2i/^ 

 feet high; basal and lower leaves simplj' pinnate with 7 or 5 (or 3) obovate to 

 oblong serrate leaflets % to 3 inches long; upper leaves biternate or ternate-pin- 

 nate, the divisions narrowly oblanceolate, acute, laciniate or serrulate, especially 

 at apex, about I/2 to 2 inches long; rays about 25 to 30, little unequal, % to 3 inches 

 long; pedicels 1 to II/2 lines long; bracts linear below, parted above into 3 filiform 



