678 FLORA. 



2. Apium leptophyflum (DC.) F. Muell. Fine-leaved Marsh Parsley. 

 (I. F. f. 2689.) Slender, much branched, 0.7-6 dm. high. Leaves ternately pinna- 

 tisected, the ultimate segments narrow, often incised; umbels 1-4 cm. broad, oppo- 

 site the leaves; fruit ovate, glabrous, about 2 mm. long, the ribs equal and promi- 

 nent. In moist grounds, N. J.; " St. Louis, Mo." (Nuttall). Common in the South- 

 ern States. Widely distributed in tropical Am. and the Old World. June-Aug. 



17. AMMOSELINUM T. & G. 



Low annuals, with ternately divided finely dissected leaves, and small white 

 flowers in terminal slender-rayed umbels. Involucels of a few linear or dissected 

 bracts. Calyx-teeth obsolete. Fruit laterally flattened, strongly ribbed, the ribs 

 tuberculate or spinulose-tuberculate ; pericarp thick and dense; oil-tubes solitary in 

 the intervals, and 2 on the commissural side. Styles and conic stylopodium short. 

 [Greek, sand-parsley.] Two known species, of the southwestern U. S. and Mex. 



1. Ammoselinum Popei T. & G. Pope's Sand-parsley. (I. F. f. 2668.) 

 Diffusely branched, 1.5-4 dm. high, the branches, rays of the umbels and pedicels 

 rough. Lower leaves slender -petioled, the upper sessile, or nearly so, all dissected 

 into linear segments about 1 mm. wide; involucre usually of 1 dissected leaf or more; 

 longer rays of the umbels 2.5 cm. long in fruit, or less, the shorter ones often 1- 

 flowered; fruit ovate, 4-5 mm. long, narrowed above, 2 mm. wide, or a little more, 

 the ribs rather strongly tubercled, or even spinulose. In sandy soil, Kans. to Tex., 

 Mex. and Ariz. April-May. 



18. PETROSELINUM Hoffm. 



Annual or biennial herbs, with 1-3 -pinnate leaves, and yellow or yellowish 

 flowers in compound umbels. Calyx- teeth obsolete. Stylopodium short-conic. 

 Fruit ovate. Carpels with 5 filiform ribs. Oil-tubes solitary in the intervals, 2 on 

 the commissural side. [Greek, rock-parsley.] A genus of 5 European species. 



I. Petroselinum Petroselinum (L.) Karst. Parsley. (I. F. f. 2687.) 

 Usually biennial, 3-9 dm. high, glabrous. Leaves bipinnate, the segments ovate, 

 dentate, or incised, or those of the upper leaves linear-oblong and entire; umbels 

 peduncled, 2.5-6 cm. broad, 15-20-rayed; pedicels about 3 mm. long; involucre of 

 2-4 linear bracts; bractlets of the involucels subulate; fruit glabrous, about 4 mm. 

 long, the ribs rather prominent when dry. Md. to Ont., escaped from cultivation. 

 Introduced from Europe. Summer. \~Aphtm Petrose/iiiutn L.] 



19. ZIZIA Koch. 



Perennial herbs, with ternate or ternately compound leaves, or the basal ones 

 undivided, and compound umbels of yellow flowers. Involucre none; involucels 

 of several small bracts. Calyx-teeth prominent. Stylopodium none. Styles elon- 

 1. Fruit ovoid, or oblong, glabrous, or nearly so, somewhat compressed, the 

 ril >s filiform, wingless; oil-tubes solitary in the intervals, with a small one under each 

 rib. S.cd-face flat. [In honor of I. B. Ziz, a Rhenish botanist.] Three species. 



Basal leaves 2-3-ternately compound. 



Rays of the umbel numerous, stout; fruit 4 mm. long. 1. Z. aurea. 



Rays of the umbel 2-12, slender; fruit about 2 mm. long. 2. Z. Bebbii. 



Basal leaves cordate, undivided ; fruit about 3 mm. long. 3. Z. cordata. 



1. Zizia aurea (L.) Koch. Early or Golden Meadow-parsnip. (I. F. 

 f. 2690.) Glabrous. 3-8 dm. high. Basal and lower leaves 2-3-ternately com- 

 pound, the segments ovate, or ovate-lanceolate. 2-5 cm. long, sharply serrate; 

 upper leaves shorter -petioled, ternate: rays 9-25. stout, ascending, 2-5 cm. long; 

 fruit oblong. In gelds, meadows and swamps, N. B. to Ont., S. Dak.. Fla. and 

 Tex. April-June. 



2. Zizia Bebbii (Coult. & Rose) Britton. Peru's Zizia. (I. F. f. 2691.) 

 Slender, ascending. 3-0 dm. high. Basal ami Lower leaves 2-3-ternate. the seg- 

 ment- ovate, oblong or oval, mostly obtuse. 1 2.5 em. long, sharply serrate; stem- 

 leaves ternate, or biternate. their segments lanceolate, generally narrower than 



