band and with much greater surface display than the dorsal ribs; oil tubes moder- 

 ately large; seed not very oily, not sulcate or only very shallowly so under the 

 tubes, the face plane to concave. 



Along streams, in marshes and other wet places in Okla. (McCurtain, Adair, 

 Murray and Washington cos.) and e., cen. and n. Tex., May-Sept.; throughout e. 

 U.S. and Can., s. to Ga. and La., w. to the Dakotas and Tex. 



2. Cicuta mexicana Coult. & Rose. Fig. 588. 



Plant stout, from a usually erect tuberous base bearing fleshy-tuberous roots, 

 9-24 dm. high; leaves ovate-deltoid, to 35 cm. long, ternate-pinnate or 2-pinnate; 

 leaflets oblong-lanceolate, 4-10 cm. long, 1.5-4 cm. wide, finely to coarsely serrate, 

 thick and strongly reticulate; peduncles 5-9 cm. long; involucre of 1 to several 

 narrow bracts or lacking; involucel of several lanceolate to linear acute scarious- 

 margined bractlets 2-5 mm. long, shorter than or equalling the flowers; rays very 

 unequal, 2-8 cm. long; pedicels 3-15 mm. long; fruit orbicular or nearly so, 2-3 

 mm. long, constricted at the commissure, the low ribs broad and corky, subequal 

 in surface display, broader than the intervals, the lateral ribs of the two carpels 

 separated by an interval; oil tubes large; seed very oily, deeply sulcate under the 

 tubes, the face plane or concave. Cicuta Curtissii Coult. & Rose. 



In swamps and other wet places in e. third of Tex. and along the coast, May- 

 Oct.; from Middle Atl. U.S., s. to the Isthmus of Tehuantepec, Mex. 



3. Cicuta Douglasii (DC.) Coult. & Rose. 



Stems stout, from a vertical or horizontal short or elongate tuberous base that 

 bears fibrous or fleshy-fibrous roots, 6-20 dm. tall; leaves oblong to ovate in gen- 

 eral outline; petioles 1-8 cm. long; blade 12-38 cm. long, 7-22 cm. broad, 1- to 

 3-pinnate; leaflets linear-lanceolate to ovate-lanceolate, 3-10 cm. long, 6-35 mm. 

 wide, remotely to coarsely serrate or incised; peduncles 5-15 cm. long; involucre 

 of 1 to several narrow bracts, or wanting; involucel of several ovate-lanceolate to 

 linear acute to acuminate scarious-margined bractlets that are 2-15 mm. long; rays 

 2-6 cm. long; pedicels 3-8 mm. long; fruit ovoid to orbicular, 2-4 mm. long, 2-3 

 mm. broad, constricted at the commissure; ribs low, broad and corky, subequal in 

 surface display, broader than the reddish-brown or homochromous intervals, the 

 lateral ribs of the 2 carpels separated by intervals; oil tubes small; seeds not very 

 oily, not sulcate under the tubes, the face plane. C. occidentalis Greene. 



In ditches, fresh-water marshes, swamps, shallow standing water or flowing 

 streams, in N.M. (rather widespread) and Ariz. (Apache, Navajo, Coconino and 

 Greenlee cos.), June- Aug.; Mont, and Alas, to N.M., Ariz., Calif, and Chih. 



19. Lilaeopsis Greene 



About a half dozen species of world-wide distribution. 



1. Lilaeopsis recurvata A.W.Hill. Fig. 589. 



Glabrous inconspicuous perennial; stems creeping and rooting in mud; leaves 

 reduced to fistulose cylindric petioles that are transversely septate, elongate when 

 growing in water; peduncles shorter than leaves; umbels simple; involucre of a few 

 small bracts; calyx teeth minute; corolla white; stylopodium depressed; fruit sub- 

 globose or slightly compressed laterally, 2-2.5 mm. long, the lateral ribs very thick 

 and corky, the dorsal ribs filiform, the oil tubes solitary in the intervals (2 on the 

 commissure), the seed face somewhat convex. 



On mud in or about streams, ponds and lakes in s. Ariz. (Cochise, Santa Cruz, 

 Pima and Pinal cos.), July-Aug.; known only from s. Ariz. 



1240 



