APPENDIX 1355 



1. Conium macul^tum L. Plants 1-2 m. tall, the stem usually much-branched: 

 leaf -blades broad, the segments very numerous: umbels rather long-peduncled; rays 

 2-4 cm. long: petals white, obovate or cuneate, mostly about 1 mm. long: fruita 

 ovoid, 2.5-3 mm. long. 



In waste places, Quebec and Ontario to California, Florida and Mexico. Naturalized 

 from Europe. Summer. Poison Hemlock. 



Page 867, after Apium nodiflorum, insert: 



16a. PETROSELINUM Hoffm. 



Herbs resembling Apium in habit. Leaves alternate: blades 1-3-pinnate, the 

 leaflets toothed, incised or lobed. Umbels compound. Sepals minute or obsolete. 

 Petals small, yellow, very broad, excepting the bent tip. Fruit slightly flattened 

 laterally: carpels with 5 slender ribs, with a single oil-tube in each interval and 2 in 

 the inner face.— Differs from Apium in the yellow corolla and the ovoid fruit with a 

 prominent stylopodium. 



1. Petroselinum Petroselinum (L.) Karst. Stems 2-5 dm. tall: leaf -segments 

 linear or linear-filiform, or those of the basal leaves cuneate: petals mostly less than 

 1 mm. long: fruits ovoid, 3.5-4 mm. long. 



In waste places, Ontario to North Carolina, Arkansas and Texas. Naturalized from 

 Europe. Summer. Parsley. 



Page 868, after Zizia Bebbii, add: 



4. Zizia arenicola Eose. Stems 4-6 dm. tall, sparingly branched above: leaf- 

 blades once or twice ternately compound; leaflets orbicular to lanceolate, often 

 rounded at the apex, coarsely toothed: umbels long-peduncled: rays few, nearly equal, 

 1.5-2.5 cm. long, erect or ascending: fruits oblong, 4-4.5 mm. long, prominently 

 ribbed. — Differs from Z. Behbii in the more compact umbels, the shorter rays, and 

 the larger, elongated fruits. 



In dry woods, Georgia. Spring. 



Page 868, aiter Cicuta Curtissii, insert: 



20a. HARPERELLA Rose. 



Perennial aquatic caulescent herbs. Leaves alternate, reduced to terete jointed 

 phyllodia. Flowers perfect, in compound umbels. Involucres and involucels incon- 

 spicuous. Sepals acute, slightly unequal. Petals white, broad. Stylopodium short. 

 Fruits oval, flattened laterally: carpels rather prominently 5-angled: oil-tubes solitary 

 in the intervals and 2 in the inner side. — Differs from Cicuta in the slender ribs of 

 the fruits and the phyllodia. 



1. Harperella nodosa Eose. Plants stout, stiff, 3-13 dm. tall, rather freely 

 branched, the stem fluted: basal and lower cauline leaves mostly 2-4.5 dm. long, 

 without bulblets in the axils: peduncles elongate, mostly 2-4 cm. long: umbel-rays 

 5-15, becoming 1-2.5 cm. long: corolla 3-3.5 mm. wide: anthers barely 0.5 mm. long: 

 fruits about 1.5 mm. wide. 



In shallow ponds, southwestern Georgia. Spring and summer. 



2. Harperella fluvi^tilis Eose. Plants slender, weak, 1-3 dm. tall, sparingly 

 branched, the stem angled: basal and lower cauline leaves mostly 1-1.5 dm. long, with 

 bulblets in their axils: peduncles short, mostly 1-2 cm. long: umbel-rays 2-5, becom- 

 ing 5-8 mm. long: corolla 1-1.5 mm. wide: anthers barely 0.3 mm. long: fruits about 

 1 mm. wide. 



In rocky beds of streams. Lookout and Sand mountains, Alabama. Summer and fall. 

 Page 870, after Ptilimnium capillaceum, insert : 



la. Ptilimnium costitum (Ell.) C. & E. Stems stout, 1.5 dm. tall or less, 

 branched above: leaf-blades larger and more copiously dissected than in P. capilla- 

 ceum, the slender segments often crowded: umbels 10 cm. broad or less; rays becom- 

 ing 4 cm. long: pedicels mostly 7-8 mm. long: corolla 1.5-2 mm. broad: fruit nar- 

 rowly ovoid, 4-5 mm. long, very prominently ribbed. — Differs from P. capillaceum 

 in the larger flowers and the larger and relatively narrower fruits. 



In river swamps, North Carolina to Georgia. Fall. 



