ORCHIDACEAE. 



VOL. I. 



i. Triphora trianthophora (Sw.) Rydb. 

 Nodding Pogonia. Fig. 1385. 



Arethusa trianthophora Sw. Kongl. Vet. Acad. Handl. 



(II.) 21 : 230. 1800. 



Triphora pendula Nutt. Gen. 2: 193. 1818. 

 Pogonia pendula Lindl. Bot. Reg. pi. 908, 1825. 

 Pogonia trianthophora B.S.P. Prel. Cat. N. Y. 52. 1888. 

 Triphora trianthophora Rydb. in Britton, Man. 298. 1901. 



Stems glabrous, 3'-8' high, from a tuberous root, 

 often clustered. Leaves 2-8, alternate, ovate, 3"-o," 

 long, clasping; flowers 1-7, on axillary peduncles, 

 pale purple, at first nearly erect, soon drooping; 

 perianth 6"-8" long; sepals and petals about equal, 

 connivent, elliptic, obtuse; lip clawed, somewhat 

 3-lobed, roughish or crisped above, not crested, about 

 as long as the petals; capsule oval, drooping, about 

 6" long. 



In rich woods, Canada(?), Maine to Rhode Island, 

 Florida, Wisconsin, Missouri and Kansas. Ascends to 

 3500 ft. in North Carolina. Local. Three-birds. Aug.- 

 Sept. 



16. ARETHUSA L. Sp. PI. 95- i?53- 



Low herbs, with small bulbs and mostly solitary flowers on bracted scapes, the solitary 

 leaf linear, hidden at first in the upper bract, protruding after flowering. Sepals and petals 

 about equal, connivent and hooded above, coherent below. Lip dilated and recurved-spreading 

 at the apex, crested on the face with straight somewhat fleshy hairs, slightly gibbous at the 

 base. Column adherent to the lip below, linear, narrowly winged and dilated at the summit. 

 Anther operculate, of 2 approximated sacs incumbent upon the column; pollinia 4, 2 in each 

 sac, powdery-granular. Capsule erect, ellipsoid, strongly angled. [Dedicated to the nymph 

 Arethusa.] 



Two known species, the following, the generic type, occurring in North America, the other 

 in Japan. 



i. Arethusa bulbosa L. Arethusa. Dragon's- 

 mouth. Wild-pink. Fig. 1386. 



Arethusa bulbosa L. Sp. PI. 950. 1753. 



Scape glabrous, s'-io' high, bearing 1-3 loose 

 sheathing bracts. Leaf linear, many-nerved, becom- 

 ing 4'-6' long; flower solitary (rarely 2), arising 

 from between a pair of small unequal scales, rose- 

 purple, i '-2' high; sepals and petals linear to elliptic, 

 obtuse, arched over the column; lip usually drooping 

 beneath the sepals and petals, the apex broad, 

 rounded, often fringed or toothed, variegated with 

 purplish blotches, bearded, crested down the face 

 in three white hairy ridges; capsule about :' long, 

 ellipsoid, strongly 6-ribbed, rarely maturing. 



In bogs, Newfoundland to Ontario and Minnesota, 

 South Carolina and Indiana. May-June. 



17. LIMODORUM L. Sp. PI. 950. 1753. 

 [CALOPOGON R. Br. in Alt. Hort. Kew. Ed. 2, 5 : 204. 1813.] 



Scapose herbs, with round solid bulbs which arise from the bulb of the previous year, a 

 leaf appearing the first season, succeeded in the following year by the scape. Flowers sev- 

 eral in a loose terminal spike or raceme. Sepals and petals nearly alike, separate, spread- 

 ing. Column elongated, 2-winged above. Anther terminal, operculate, sessile; pollinia 

 solitary, i in each sac, loosely granular. Lip spreading, raised on a narrow stalk, dilated at 

 the apex, bearded on the upper side with long club-shaped hairs. [Greek, a meadow-gift] 



Five species, natives of the eastern United States, Cuba and the Bahamas. Type species: 

 Limodorum tuberosum L. 



