47 
(j 
and Archemora from Peucedamim, also servo to merge these two genera 
into one well-defined genus.® 
1. T. teretifolia DC. l.c. Stem 2 to 6 feet high, fistulous: 
leaves reduced to cylindrical hollow pointed petioles (jointed by 
transverse partitions): umbel 6 to 12-rayed, with involucre and in- 
volucels of few or many subulate bracts: rays ^ to inches long; 
pedicels 2 to 3 lines long: fruit somewhat obovate, 2 to 2^4 lines 
long: oil-tubes large, filling the intervals, 2 to 4 on the commis- 
sural side. (Fig. 24.) — Peucedanum te7‘etifoliu7n Benth. & Hook. 
Ponds and swamps, from Delaware (Can Commons) to Florida, and 
westward to Louisiana. FL August and September. 
2. T. ternata C. & R. Bot. Gazette, xii. 74. Stem slender, 
2 to 3 feet high: leaves few, with very long petioles, ternately 
divided into more or less elongated linear or filiform segments, or 
sometimes reduced to a flat-tipped petiole: umbel 6 to 9-rayed, 
with involucre of tew small bracts, and involucels of several 
setaceous bractlets; rays .1 to inches long: pedicels 3 to 5 lines 
long: fruit ovate to obovate, 2 lines long: oil-tubes smaller, 4 on 
the commissural side. (Fig. 25.) — Archemora ternata Nutt., 
Neuro^hyllum longifolium Torr. & Gray. 
ft 
Pine barren swamps, North Carolina to Florida. FI. November. 
3. T. rigida C. & R. l.c. Stem 2 to 5 feet high: leaves 
pinnate, 3 to 9-foliolate ; leaflets from ovate or lanceolate-oblong to 
linear-lanceolate, entire or remotelv toothed : umbel 15 to 25- 
rayed, with involucre of few small bracts, and involucels of severrd 
setaceous bractlets; rays to 4 inches long; pedicels 3 to 9 lines 
long: fruit oblong, 2^ to lines long: oil-tubes 4 to 6 on the 
commissural side. (Fig. 26.) — Archemora rigida DC. 
Swamps, New York to Minnesota, and south to the Gulf. 
Very variable in foliage and size of fruit, so much so that DeCandolle 
made four species of it. An extreme form is 
Var. ambigua, with elongated linear entire leaves, fewer 
rays; and fruit but 2 lines long. — Archemora rigida^ var. ambigua 
Torr. & Gray. 
Apparently more restricted than the type, New Jersey {Gray, Canby, 
Martindale), South Carolina (Ravenel), Tennessee (Oattmger). 
A good deal of material labeled as this variety really belongs to the 
6 Botanical Gazette, xii. 73. 
/ 
