458 ORCHIDACEJE. (ORCHIS FAMILY.) 



* * Sepal* (brown) linear, spreading, much longer than the erect petals: lip crcsiea, 



3-lobed. 

 8. P. divaricata, R. Br. Leaves 2, sessile, lanceolate, one near the 

 middle of the stem, the other smaller and bract-like at the hase of the solitary 

 terminal flower; sepals purplish-brown, broadly linear, and, like the flesh- 

 colored lanceolate petals, recurved at the apex ; lip half-cylindrical, wavy and 

 crenulate on the margins, 3-lobed at the apex, greenish veined with purple ; 

 crest beardless. — Swamps, Florida to North Carolina. May. — Stem l°-2° 

 high. Leaves 2'- 5' long. Sepals 1'- 1±' long. 



4. P. verticillata, Nutt. Leaves 5, ohovatc-oblong, abruptly pointed, 

 whorled at the base of the solitary reddish-brown flower ; sepals linear, spread- 

 ing, 3 times as long as the erect oblong yellowish petals, and yellowish 3-lobed 

 wavy lip. — Low shady woods, Florida, and northward. May. — Stem 1° high. 

 Leaves enlarged in fruit. Flower peduncled. Sepals 2' long. 



10. ARETHTJSA, Gronov. 



Sepals and petals alike and nearly equal, cohering at the base, arching and 

 connivent over the column. Lip adnate to the base of the column, dilated and 

 bent downward above the middle, crested within. Column incurved, expanded 

 and petal-like at the apex. Anther terminal, lid-like, with the cells approxi- 

 mate. Pollen-masses 4, powdery. — Scape erect from a solid globular tuber, 

 sheathed, bearing a single large terminal flower. 



1. A. bulbosa, L. — Bogs on the mountains of Carolina, Michaux, and 



northward. May. — Scape 6' - 9' high. Sheaths 3-4, the uppermost enclosing 

 a linear latc-dcvcloped leaf. Flower 1'- 2' long, 2-bracted, bright purple and 

 fragrant. 



11. ORCHIS, L. Oncrus. 



Sepals and petals nearly equal, arching and connivent over the column, or 

 the lateral sepals spreading. Lip adnate to the base of the column, depending, 

 spurred at the base. Anther terminal, erect, the cells contiguous and parallel. 

 Pollen-masses 2, waxy, stalked, and, with the two distinct glands, enclosed in a 

 common sac or fold of the stigma. — Stem mostly scape-like, leafy at the base. 

 Flowers showy, spiked. 



1. O. spectabilis, L. Leaves 2, obovate-oblong, about as long as the 

 3 - 5-flowercd 5-angled scape ; bracts lanceolate, leafy, mostly longer than the 

 flowers ; sepals and petals connivent. oblong, purple ; lip white, obovate, entire, 

 crenulate, as long as the club-shaped spur. —Rich shady woods in the upper 

 districts, and northward. May. — Root of thick clustered fibres. Scape 4' - 6' 

 high. Flowers B"-8" long. 



12. GYMNADENIA, R. Brown. 



Sepalfl and petals nearly equal, the lateral sepals spreading, the upper, with 

 the rather shorter petals, arching and connivent over the short column. Lip 





