5. Clelstes Rich. 



A genus of about 40 species in the Western Hemisphere, mainly in South 

 America. 



1. Cleistes divaricata (L.) Ames. Spreading pogonia. Fig. 368. 



Terrestrial herb with slender fibrous root, rigidly erect, to 75 cm. tall; leaf 

 solitary, inserted above the middle of the stem, oblong-lanceolate, to 15 cm. long 

 and 2 cm. wide; flowers one to rarely 3 that terminate the stem; perianth parts 

 distinct; sepals to 65 mm. long, about 5 mm. wide; petals magenta-pink to white, 

 spatulate-oblanceolate. to 45 mm. long and 12 mm. wide; lip crested, about as 

 long as petals, oblong-cuneate, strongly veined, indistinctly 3-lobed, crenulate 

 along the margins, with a linear-grooved somewhat fleshy papillose crest through 

 the median line of the disk, 3.5-4.5 cm. long, about 2 cm. wide above the middle; 

 lateral lobes broadly rounded at the apex, involute to form a trough; apical 

 lobe ovate-triangular, somewhat revolute and decurved, projecting about 1 cm. 

 beyond the lateral lobes; column free, 2-2.5 cm. long, eroded at apex; capsule 

 erect, cylindrical. Pogonia divaricata (L. ) R. Br. 



This species is represented in Tex. by a collection made by E. J. Palmer, but 

 the exact locality is unknown. It doubtlessly occurs in the s.e. part of the state 

 and is to be looked for in low grassy pine barrens, savannahs, prairies, flatwoods, 

 bogs, swamps and along stream banks; rare and of local occurrence from N. J. 

 and Del. s. to cen. Fla., w. to Tenn., Ky. and Tex.; Apr.-July. 



The ascending and often recurved linear-lanceolate brownish sepals are dis- 

 tinctive. 



6. Calopogon R. Br. 



Terrestrial scapose herbs arising from orbicular or ellipsoid corms, with a 

 solitary (rarely more) grasslike leaf sheathing the stem near the base; inflores- 

 cence a dense or lax few- to several-flowered terminal raceme; flowers conspicuous, 

 showy, varying in color from white to deep-crimson or magenta; sepals and petals 

 free, spreading; lip forming the upper segment of the perianth, with a minute 

 lateral lobe on each side near the base, strongly dilated and bearded above with 

 numerous clavellate hairs and papillae at the apex; column free, slender and some- 

 what incurved, winged on each side at the apex; anther terminal, operculate; 

 pollinia four, two in each anther cefl, the grains connected by filaments; capsule 

 erect, cylindrical or ellipsoid. 



A small New World genus of 4 species, chiefly occurring in southeastern United 

 States with one species widespread in eastern Canada and the United States. The 

 bearded lip, which forms the uppermost segment of the flower, is distinctive. 



1. Flowers usually 2 to 5, opening almost simultaneously; leaves grasslike, about 

 2 mm. wide 1. C. barbatus. 



1. Flowers usually more than 8, opening in slow succession up the raceme to 

 extend over a prolonged period; leaves usually much more than 

 5 mm. wide 2. C. pulchettus. 



1. Calopogon barbatus (Walt.) Ames. Bearded grass-pink. 



Plant scapose, slender, erect, somewhat rigid, glabrous, 1.5-4.5 dm. tall; root- 

 stock a bulbous corm; having a tuft of roots at the proximal end and usually the 

 remains of the old stalks at the distal end; stem light green or tinged with reddish 

 brown (occasionally two stems are produced from the same corm); leaves (when 

 present) one or two, basal, narrowly linear and grasslike, long-acuminate, strongly 

 ribbed, 5-18 cm. long, about 2 mm. wide; raceme short, often somewhat capitate, 

 three- to five- (or rarely more-) flowered; floral bracts subulate to shortly lanceo- 

 late, 2-4 mm. long; flowers rose-pink, rarely white, mostly opening simultaneously, 



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