1887. | 3 BOTANICAL GAZETTE. 13 
with 3 to 7-parted leaves ; radical long-petioled ; cauline short- 
petioled or sessile; their divisions sharply cut and serrate. 
Involucre and involucels few-leaved. Flowers greenish or 
yellowish. May to August. 
1, S.Canadensis L. Spec. 235. Leaf-divisions 3 tos: sterile 
flowers comparatively few, short pedicelled: style shorter 
than prickles: oil-ducts mostly large, occupying nearly the 
whole thickness of the pericarp ; seed-section deeply sinuous 
in outline (figs. 1 and 2).—Common throughout the region. 
2. S.Marylandicea L. Spec. 235. Leaf-divisions 5 to 7: 
sterile flowers numerous, longer pedicelled : style much longer 
than prickles: oil-ducts smaller, in thicker pericarp; seed- 
section nearly entire (fig. 3 ).—Common throughout the region, 
strongly toothed or cleft. Involucre and involucels few- 
leaved. Flowers white. May to June. 
1, 0. longistylis DC. Prodr. iv. 232. Slightly pubescent or 
smooth: styles slender, nearly as long as the ovary (not the 
fruit): seed-section deeply and broadly concave (figs. 4 
and 5 ).—Throughout the northern states and westward, 
2. 0. brevistylis DC. Prodr. iv. 232. Villous pubescent: 
styles conical, very short: seed-section less deeply and more 
narrowly concave (fig. 6).—Throughout the northern states 
and southward to N. Carolina. It is a question whether the 
specific name O, dulcis Raf. may not have the prior claim. 
The western O. nuda Torr. has the seed-section still less con- 
cave and strengthening cells less developed and well repre- 
sents a third member in the series as here arranged. __ 
CONIOSELINUM Fisch.—Fruit oblong, flattened dor- 
sally, smooth: carpels with 5 prominent primary ribs, the 
lateral ones extended into broad wings; oil-ducts I to 4 in the 
intervals, 4 to 8 on the commissural side; seed slightly con- 
cave on the inner face (figs. 7 and 8).—One to five feet high, 
sometimes smaller, smooth. Leaves 2 to 3-pinnately com- 
pound, with inflated petioles. Involucre and involucels few- 
