648 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



white; stylopodium depressed; fruit oval to orbicular, 2 to 3 mm. 

 long, laterally compressed, the ribs prominent, corky, the oil tubes 

 solitary in the intervals, 2 to several on the commissure, the seed face 

 plane. 



1. Sium suave Walt., Fl. Carol. 115. 1788. 



Sium cicutaefolium GmeL, Syst. Nat. 2: 482. 1791. 



Near Tuba, Coconino County, in a marsh, 5,050 feet (Kearney and 

 Peebles 12857). Widely distributed in North America. 



14. BERULA. Waterparsnip 



Plants perennial from fascicled fibrous roots, caulescent, glabrous, 

 aquatic ; leaves simply pinnate, the segments linear to ovate, entire to 

 variously lobed; peduncles axillary and terminal, exceeding the 

 leaves; umbels compound; involucre conspicuous, of 6 to 8 unequal 

 linear or lanceolate bracts; involucel of 4 to 8 conspicuous, lanceolate 

 or linear bractlets ; 'calyx teeth inconspicuous; corolla white; stylo- 

 podium depressed-conic; fruit oval to orbicular, 1.5 to 2 mm. long, 

 laterally compressed, emarginate at base, the ribs slender, inconspicu- 

 ous, scarcely raised above the surface, the oil tubes numerous and 

 somewhat contiguous in the innermost layer of the mericarp immedi- 

 ately surrounding the seed, the seed face plane. 



1. Berula erecta (Huds.) Coville, Contrib. U. S. Natl. Herbarium 4: 

 115. 1893. 



Sium erectum Huds., Fl. Angl. 103. 1762. 



Apache County to Coconino County, south to Cochise and Santa 

 Cruz Counties, 4,000 to 7,000 feet, wet places. Widely distributed 

 in North America; Eurasia. 



15. LILAEOPSIS 



Plants perennial, glabrous; stems creeping and rooting in the mud; 

 leaves reduced to hollow cylindric petioles, transversely septate, 

 elongate when growing in water; peduncles shorter than the leaves; 

 umbels simple; involucre of few small bracts; calyx teeth minute; 

 corolla white; stylopodium depressed; fruit subglobose or slightly 

 compressed laterally, 2 to 2.25 mm. long, the lateral ribs very thick 

 and corky, the dorsal ribs filiform, the oil tubes solitary in the inter- 

 vals, 2 on the commissure, the seed face somewhat convex. 



1. Lilaeopsis recurva A. W. Hill, Linn. Soc. London Jour. Bot. 47: 535. 

 1927. 



Lilaeopsis schaffneriana Coult. and Rose, Bot. Gaz. 24: 48. 

 1897 (in part). Not of Schlecht. 



Huachuca Mountains, Cochise County (Lemmon 2895, etc.), Santa 

 Cruz River valley near Tucson, Pima County (Pringle in 1881, the 

 type collection) . Known only from southern Arizona. 



16. FOENICULUM. Fennel 



Plants perennial, caulescent, branching, glabrous, with a strong 

 odor of anise; stem tall; leaves large, pinnately decompound, the seg- 



