526 order cxxn. — orchidace^. 



Genus IX.— TRIPH'ORA. 18—1. 

 (From tria, three, and phero, I bear ; alluding to its three flowers.) 



Segments of the perianth lanceolate, acute, distinct, conni- 

 vent. Lip unguiculate, cucullate. Column spatulate, flat, 

 ■without wings. Pollen farinaceous. 



1. T. pen'dula, (Nutt.) Stem erect, obscurely angled, nodding at the 

 summit, succulent. Leaves alternate, amplexicuul, decurrent. Flowers 

 axillary and terminal, 3 — 4, on short peduncles. Lip 3-lobed, the lat- 

 eral ones inflexed. — Purple. If. July — Aug. Damp soils. 12 — 18 

 inches. 



Genus X.— OR'CHIS. L. 18-1. 

 (Named from the shape of its roots.) 



Perianth ringent, the upper segment vaulted. Lip dilated, 

 entire, with a spur at the base. Pollen masses 2, affixed by 

 the base, terminal, pedicellate. Glands contained in a common 

 bag. 



1. O. spectab'ilis, (L.) Root palmate ; scape pentangular, sometimes 

 bearing a leaf. Flowers few, large ; lip obovate, undivided, crenate, 

 retuse ; segments of the perianth connivent; spur clavate. Bracts 

 longer than the flower. Leaves radical, oval, glabrous, generally 2, 

 large. — Purple and white. If. June. Shady woods. 8 — 10 inches. 



2. 0. ni'vea, (Nutt.) Scape erect; lower leaves linear, very long, 

 subulate. Flowers in dense spikes. Bracts short. Lip linear, oblong, 

 entire ; the other segments spreading ; spur filiform. Column small. 

 Pollen masses nearly sessile. — White. If. May — June. Southern 

 Geo. 



3. O. vir'idis, (L.) A small plant. Lip linear, 3-toothed at the apex ; 

 other segments of the perianth connivent ; spur obtuse, somewhat in- 

 flated. Bracts longer than the flowers. — Greenish-white. Mountains. 

 3 inches. 



4. O. bidenta'ta, (Ell.) Stem erect, nearly naked. Leaves narrow, 

 lanceolate. Lip oval, oblong, 2-toothed at the base ; the other seg- 

 ments ovate, expanding; spur short, thickened at the point. — Yellow- 

 ish. 2[ . May — June. Middle Car. and Geo. 12 — 18 inches. 



Genus XL— HABENA/RIA. Will. 18—1. (Platanthera, Rich.) 

 (From habena, a rein, in allusion to its spur.) 



Perianth ringent. Lip dilated, toothed, lobed, or fringed, 

 spurred at the base. Pollen masses pedicellate. Glands of the 

 pedicels naked, distant. 



1. H. cilia'ris, (Br.) Stem erect, leafy, glabrous. Leaves lanceo- 

 late, acute, entire, sheathing at the base, long. Flowers in terminal 

 spikes. Lip oblong, lanceolate, beautifully ciliate, double the length 

 of the other segments ; spur filiform, long. — Orange-yellow, varying 

 with age. If. In moist lands. 1 — 2 feet. 



