86 OKCHIDACEAE. 



4. B, grandiflora (Bigel.) Kydb. Stem 3-15 dm. tall: leaf -blades oblong- 

 obovate or oblong to lanceolate, 8-30 em. long: perianth lilac-purple: lateral 

 sepals ovate, 9-11 mm. long: petals with narrow claws: lip with a spur 20-30 

 mm. long. — S. Rare, in rich woods. — Schists. 



5. B. peramoena (A. Gray) Eydb. Stem 3-9 dm. tall: leaf-blades oblong to 

 lanceolate, 8-20 cm. long: perianth violet-purple: lateral sepals broadly ovate 

 to suborbicular, 7-10 mm. long : petals as long as the sepals or nearly so, spatu- 

 late, or the body orbicular-obovate, entire or erose: lip 14-18 mm. long, the 

 lobes cuneate or flabellate, incised or erose; spur 20-25 mm. long. — S. Eare, 

 in swamps. — Sdiists. 



7. PEBULAEIA Lindl. Caulescent herbs with thick fibrous roots, the 

 stem leafy. Flowers relatively small, in a terminal spike. Perianth yellowish 

 or greenish. Sepals and petals spreading, all relatively broad. Lip lanceo- 

 late to ovate or suborbicular, usually with a lobe on each side near the base, and 

 a median tubercle, the spur longer than the blade. Anthers with horizontal 

 valves opening upward, dilated at the base, thus forming a cavity enclosing the 

 orbicular gland. 



1. P, flava (L.) Farwell. Stem 3-6 dm. tall: leaf -blades elliptic, oblong, or 

 lanceolate, 0.7-3 dm. long: bracts often shorter than the very small flowers: 

 sepals and petals 3 mm. long: lip suborbicular or broadly oval in outline, 

 3.5-4 mm. long: spur about i as long as the ovary. — S. Common, in swamps. 

 — Schists. — Sum. 



8. GYMNADENIOPSIS Eydb. Caulescent herbs. Flowers in a terminal 

 spike. Perianth white, greenish^ pink, or orange-yellow. Sepals distinct, the 

 lateral ones slightly inequilateral. Petals mostly smaller than the sepals, undu- 

 late, sinuate-lobed or erose. Lip entire, 3-lobed at the apex, or crenulate or 

 erose. Anthers with parallel approximate sacs, and naked contiguous glands. 

 Stigma with 2 or 3 appendages at the beak. 



1. Gr. clavellata (Michx.) Eydb. Stems 1-5 dm. tall, rather naked above: 

 leaves scale-like except 1 or 2 near the middle of the stem or below it; blades 

 oblong to oblong-lanceolate, 5-12 cm. long: perianth whitish or greenish: 

 lateral sepals ovate to oval, 2-3.5 mm. long: petals 3-4 mm. long, sinuately 

 3-lobed: lip slightly dilated upward, 3-5 mm. long; spur clavate. — N. S. 

 Common, in wet thickets and swamps. — Sandstones and shales, schists. — Sum. 



9. ISOTE.IA Raf. Scapose herbs with elongate roots. Leaves reduced to 

 scales at the base of the scape. Scape topped by a whorl of spreading leaf- 

 like bracts. Flowers solitary or 2 together. Perianth purple or greenish. 

 Sepals nearly equal, much longer than the petals. Petals broader than the 

 sepals. Lip 3-lobed at the apex, sessile, crested along the middle. Capsule 

 erect. 



1. I. verticillata (Willd.) Eaf. Scapes 2-4.5 dm. tall: blades of the whorled 

 bracts mainly elliptic to oval or obovate, 2.5-8 cm. long: lateral sepals narrowly 

 linear, 30-50 mm. long or longer: petals linear, 15-20 mm. long: lip-body 10-15 

 mm. long, terminating in 2 lateral lobes and a middle broad lobe: capsule 2-3 

 mm. long. — E. S. Common, in rich woods. — Schists. — Spr. 



10. POGONIA Juss. Caulescent herbs with cord-like roots. Leaves mostly 

 solitary or 2 on the stem. Flowers solitary or 3 together. Perianth mainly 

 pink, rose, or lilac. Sepals nearly equal, slightly longer than the petals. Petals 

 broader than the sepals. Lip fringed or crisped near the apex, crested, not 

 lobed. Capsule erect. 



