322 OECHIDACEAE 



2. Ponthieva Brittonae 0. Ames. Plants similar to those of P. racemosa, but 

 smaller and with a more slender raceme: leaf -blades oblong, ovate or obovate, 3-11 

 cm. long, acute: raceme 4-16 cm. long: bracts linear-lanceolate, 4-S cm. long: 

 median sepal oblong-lanceolate or oblong, 4-^.5 mm. long, obtuse; lateral sepals ovate, 

 4-4.5 mm. long, acute: petals 4-4.5 mm. long, the blades decidedly longer than wide: 

 lip 3-3.5 mm. long: anther narrowly oblong. 



In rocky pine lands, southern peninsular Florida. Also in the Bahamas. Winter. 



26. PHYSURUS L. C. Rich. 

 Caulescent herbs, the stems leafy. Leaves with wide blades. Flowers in a spike 

 or spike-like raceme. Perianth whitish or greenish. Lateral sepals relatively broad, 

 decurrent together with the base of the lip as a spur partially adnate to the hypan- 

 thium. Petals mostly smaller than the sepals. Lip 3-lobed, the terminal lobe quite 

 as large as the body of the lateral lobes, with a reflexed tip, the broad claw-like base 

 forming part of the spur; callosities wanting. 



1. Physurus querceticola Lindl. Plants 1-3 dm. tall : leaf -blades lanceolate to 

 ovate, 1-6 cm. long: lateral sepals 4-4.5 mm. long: petals 3.5-4 mm. long, narrower 

 than the sepals, inequilateral. 



In hammocks and woods, Florida to Louisiana. Spring to fall. 



27. PERAMIUM Salisb. 

 Caulescent herbs, with scape-like stems. Leaves narrow, those near the base of 

 the stem with dilated blotched blades, those higher up mere sheathing scales. 

 Flowers in a spike. Perianth white or pink. Lateral sepals of an ovate type. 

 Petals very inequilateral. Lip sessile, sac-like, i. e. with a small blade and a large 

 saccate base. Summer. Eattlesnake Plantain. 



Spike 1-sided: petals 3-3.5 mm. long: lip-sac with a broad border. 1. P. ophioides. 



Spike cylindric: petals 4.5-5.5 mm. long: lip-sac with a narrow border. 2. P. pubescens. 



1. Peramlum ophioides (Fernald) Rydb. Plant 1-2.5 dm. tall: blades of the 

 lower cauline leaves ovate to lanceolate-ovate, 1-2 cm. long: lateral sepals about 4 

 mm. long: petals shorter than the sepals, erose, acute: lip 4 mm. long, the edge even, 

 the tip triangular. 



In woods. Nova Scotia to Alaska ( ?) , North Carolina, Minnesota and Colorado. 



2. Peramlum pub6scens (Willd.) MacM. Plant 1.5-5 dm. tall: blades of the 

 lower cauline leaves oblong, elliptic or ovate, 2-5 cm. long: lateral sepals about 5 

 mm. long: petals about as long as the sepals, not erose, obtuse: lip 4 mm. long, the 

 edge undulate, the tip reniform or nearly so. 



In woods, Newfoundland to Minnesota, Florida and Alabama. 



28. CORYMBIS Thouars. 

 Caulescent somewhat woody herbs with fibrous roots. Leaves with plicate blades 

 terminating long sheathing bases. Flowers in a terminal panicle. Perianth greenish 

 white. Lateral sepals nearly equilateral. Petals somewhat smaller than the sepals, 

 slightly curved. Lip shorter than the petals, with a saccate base and a slightly 

 recurved blade. 



1. Corymbis polystichya (Sw.) Benth. Stems 3-5 dm. tall, branched: leaf- 

 blades elliptic to elliptic-lanceolate, 5-20 cm. long, persistent: lateral sepals oblong 

 or nearly so, 6-7 nmi. long: petals 5-6 mm. long: lip 4-4.5 mm. long, constricted 

 about the middle: capsules 9-11 mm. long. [Tropidia Eatonii O. Ames.] 



In hammocks, southern peninsular Florida. Also in the West Indies. 



