312 



ORCHIDACEAE (ORCHIS FAMILY) 



*- - Leaf solitary. 



3. P. divaricata (L.) R. Br. Plants 3-6 dm. high, bearing above the middle 

 an oblong-lanceolate leaf 6-18 cm. long, and next the flower a leafy bract; 

 sepals brownish, ascending, linear-lanceolate, 4-5 cm. long, 

 exceeding the spatulate magenta-pink or whitish petals ; lip 

 wedge-oblong, the lobes apical and rounded, with a linear- 

 grooved partly papillose crest along the middle. Swamps and 

 moist pine-barrens, N. J. to Ga. May, June. FIG. 62:]. 



-*-*- Leaves 5 in a whorl at the top of the stem. 



4. P. verticillata (Willd.) Nutt. Plants 2-3 dm. high, naked 

 except for a few scales at base and a whorl of five obovate or 

 lanceolate sessile leaves at the summit ; flow- 

 ers solitary, rarely 2 ; sepals madder-purple, 

 623. P. divaricata li ne &r, conduplicate, 4.5 cm. long ; petals ob- 

 x %. long-lanceolate ; lip wedge-oblong, 3-lobed near 



the apex, with a linear partly papillose crest 

 down the middle ; leaves about 4 cm. long at flowering time, 

 larger when the erect fruit matures. (Isotria Raf.) Woods, 

 N. E. to Fla. w. to Wise. ; not common. May, June. 

 FIG. 624. 



5. P. affinis Aust. Plants about 2 dm. high; leaves nar- 

 rower than in the preceding, 2-5 cm. long ; flowers (not rarely in pairs) yellow- 

 ish or greenish ; peduncle much shorter than the ovary and capsules ; sepals as 

 long as or longer than the petals, somewhat narrowed at base ; lip crested over 

 the whole face and on the middle of the lobes. (Isotria Rydb.) Woods, 

 very local, Vt. (Mrs. Henry Holt) and Mass, to N. J. and Pa. 



5. CALOP6GON R, Br. 



Flowers in a loose raceme, resupinate. Sepals and petals spreading, distinct. 

 Lip linear-oblong at base, dilated and bearded above with numerous clavate 

 hairs, papillose at the apex. Column free, slender, winged at the summit ; 

 anther terminal, operculate; pollen-masses 4 (2 in each anther-cell); pollen- 

 grains connected by filaments. Scape from a solid bulb, sheathed below by the 

 base of the solitary grass-like leaf, naked above. (Name composed of xa\6s, 

 beautiful, and irwyuv, beard, from the bearded lip.) LIMODORUM L., in part. 



1. C. pulchSllus (Sw.) R. Br. Plant 15-40 cm. high ; raceme 4-12-flowered; 

 flowers magenta-crimson, rarely white; lateral sepals ovate-lanceolate, faleate. 

 upper sepal narrower; petals lanceolate, obtuse, constricted near the middle : 

 lip as if hinged at base, its hairs yellow and magenta-crimson. In open bogs 

 and meadows, Nfd. to Fla., w. to Minn, and Mo. July (in our range). 



6. ARETHtTSA [Gronov.] L. 



Flowers ringent. Sepals and petals nearly alike, erect, united at base, arch- 

 ing over the column. Lip partly erect, the apical half abruptly recurved. Col- 

 umn adherent to the lip, dilated above, petal-like; anther lid-like, attached by 

 a well defined membrane, 2-celled ; pollen-masses 2 in each cell of the anther, 

 powdery, granular. Scape smooth from a solid white or greenish bulb. Leaf 

 solitary, linear, nerved, hidden in the sheaths of the scape, protruding after 

 the flower opens. (Named for the nymph Arethusa.) 



1. A. bulbbsa L. Plant 10-25 cm. high from an ovoid bulb ; scape termi- 

 nated by a solitary flower 2.5-5 cm. long, rarely 2-flowered ; sepals and petals 

 magenta-pink, rarely white, the former oblong, acute or obtuse, the lateral ones 

 falcate, the petals oblong, obtuse or obscurely pointed ; lip oblong, narrowed 

 toward the base, with ."-"> fringed yellow or white crests ; margin of lip timbril- 

 late, spotted and striated with magenta-crimson or plain ; column denticulate or 



