74 BOTANICAL GAZETTE. | April, 
oil-ducts solitary in the intervals, 2-6 on the con 
side : seed-section oblong to broadly oval : stylopodium Z ¢ , 
thick, conical (figs. 31-36).—Smooth erect aquatic erbs, 
with leaves reduced to petioles or of few narrow leaflets, in- 
Peucedanums, whieh are low dry ground western mee 
with much dissected leaves and mostly yellow flowers. cine 
fruit characters still further confirm this difference of habit, 
only to separate Tiedemannia and Archemora from ies 
num, but to unite them into a single genus. No fruit . wee 
acter can be made to separate them, and the only distinctio 
sider them a single genus, and one well distinguished ne 
Peucedanum, at least in North America. Archemora Fen 
2-6 feet high: leaves reduced to cylindrical hollow pointed 
nodose petioles: oil-ducts filling the intervals, 2~—4. on com- 
missural side (figs. 31, 32).—Virginia to Florida and Lou- 
isiana. FI, August to September. 
4 2. 7. ternata. Stem slender, 2 feet high: leaves ternate 
with linear entire leaflets, the lower long petioled, or some- 
times reduced to a flat-tipped petiole: oil-ducts snAiee i 
on commissural side (figs. 33, 34). Archemora ternata Nutt. 
—North Carolina to Florida. Fi. N vember. : 
¥ 3. 7. rigida. Stem 2-§ feet high: leaves simply pinnate, 
with 3-9 linear to lanceolate entire or remotely toothed leaflets: 
