47 



and Archemora Irom T'riirrdiuunn, iilbo serve to mMigo these two genera 

 into one well-deflntHl genus.^ 



1. T. teretifolia DC. I.e. Stem :t to (') feci high, iistuhms: 

 leaves re(hicecl to cylindrical hollow pointed petioles (jointed by 

 transverse partitions): umbel () to 12-rayed, with involucre and in- 

 volucels of few or many subulate bracts: rays J^ to Ij^ inches long; 

 pedicels '3 to 8 lines long: fruit somewhat oliovate, 'i to 2]/^ lines 

 long: oil-tubes large, filling the inler\als, )l to \ on the commis- 

 sural side. (Fig. 24.) — Pcuccdaimni tcrctijoli/au IJenth. & Hook. 



Ponds and swamps, from Delaware (Vunh}i, ('oiitiin)iiH) to Florida, and 

 westward to Louisiana. FI August and September. 



2. T. ternata C & R. Bot. Gazette, xii. 74. Stem slender, 

 2 to 8 feet high : leaves few, with very long petioles, ternately 

 divided into more or less elongated linear or filiform segments, or 

 sometimes reduced to a fiat-tippetl j:)etiolc: mnlicl (> to D-rayed, 

 wit:"! involucre of tew small bracts, and in\olucels of several 

 setaceous bractlets; rays ] to ] '., inches long: pedicels H to ~) lines 

 long: fruit ovate to obovate, 2 lines long: oil-tubes smaller, 4 on 

 the commissural side. (Fig- 25.) — Arclicniora ternata Xutt., 

 Nettrophylhim loiigifoUitin Torr. & Gra}-. 



Pine barren swamps. North Carolina to Florida. Fl. November. 

 8. T. rigida C. & K. I.e. Stem 2 to 5 feet high: leaves 

 pinnate, 3 to U-ibliolate; leaflets from ovate or lanceolate-oblong to 

 linear-lanceolate, entire or remotel\- toothed: uml)el 15 to 25- 

 rayed, with involucre of few small bracts, and involucels of severr.l 

 setaceous bractlets; rays 1 14 to 4 inches long; pedicels 8 to ',) lines 

 long: fruit oblong, 2 1^ to 8i^ lines long: oil-tubes 4 to (*> on the 

 commissural side. (Fig. 2(5.) — ArclicDiora rigida DC 



Swamps, New York to Minnesota, and south to the Gulf. 



Very variable in foliage and size of fruit, so mueh so that DeCaiidoUe 

 made four species of it. An extreme form is 



N'ar. ambigua, with elongated linear entile leaves, fewer 

 rays, and fruit but 2 lines long. —^4rr-//<7y^>/-(C riiiida^ var. anibii^iia 

 Torr. & Gray. 



Apparently more restricted than the type. New Jeisey (Uray. Cunby, 

 Mariindale), South Carolina {Ravenel). Tennessee (Gattinger). 



A good deal of material labeled as this variety really belongs to the 



6 Hotaniciil G.nzetU-, xii. 7.i. 



