476 



ORCHIDACEAE. 





2. Achroanthes unifolia (Michx.) 



Raf. Green Adder 's-mouth. 



(Fig. 1135.) 



Malaxis unifolia Michx. Fl. Bor. Am. 2: 157 

 1803. 



Achroanthes unifolia Raf. Med. Rep. (II.) 5: 

 352. 1808. 



Microstylis ophioglossoid.es Nutt. Gen. 2: 196. 

 1818. 



Stem glabrous, striate, 4 / -io / high. Leaf 

 clasping the stem near the middle, oval or 

 nearly orbicular, i / -2^ / long, io // -i^ / wide; 

 raceme I'-tf long, sometimes \ f thick; flow- 

 ers greenish, about i" long, the pedicels 

 very slender, spreading, 3 // -5 // long; sepals 

 oblong; lip broad, 3-toothed at the apex; 

 capsule oval or subglobose. 



In woods and thickets, Newfoundland to On- 

 tario and Minnesota, south to Florida, Alabama 

 and Missouri. Ascends to 4000 ft. in North Car- 

 olina. July. 



ii. LEPTORCHIS Thouars, Nouv. Bull. Soc. Plilom. 314. 1808. 



[LIPARIS L. C. Richard, Mem. Mus. Paris, 4: 43. 1818.] 



Low herbs, with solid bulbs, the base of the stem sheathed by several scales and 2 broad 

 shining leaves. Flowers in terminal racemes. Sepals and petals nearly equal, linear, spread- 

 ing, petals usually very narrow. Column elongated, incurved, thickened and margined 

 above. Pollinia 2 in each sac of the anther smooth and waxy, the pairs slightly united, 

 without stalk, threads or glands. Lip nearly flat, often bearing 2 tubercles above the base. 

 [Greek, signifying a slender orchid.] 



About 100 species, widely distributed in temperate and tropical regions; only the following 

 known to occur in North America. 



Raceme many-flowered; lip as long as the petals. 

 Raceme few-flowered; lip shorter than the petals. 



1. L. liliifolia. 



2. L. Loeselii. 



i. Leptorchis liliifolia (L/.) Kuntze. Large Twayblade. (Fig. 1136.) 



Ophrys liliifolia L,. Sp. PI. 946. 1753. 



Liparis liliifolia L. C. Rich. Lindl. Bot. Reg. 

 pi. 882. 1825. 



Leptorchis liliifolia Kuntze, Rev. Gen. PI. 671. 

 1891. 



Scape 4 / -io / high, 5-io-striate. Leaves 

 ovate or oval, 2 / ~5 / long, \'-z% f wide, ob- 

 tuse, keeled below, the sheaths large and 

 loose. Raceme sometimes 6' long; flowers 

 numerous, showy; sepals and petals some- 

 what reflexed; petals very narrow or thread- 

 like; lip erect, large, 5 // -6 // long, about as 

 long as the petals, wedge-obovate; column 

 i>z"long, incurved, dilated at the summit; 

 pedicels slender, ascending or spreading, 

 4 // -8" long; capsule somewhat club-shaped, 

 about 6" long, the pedicel thickened in fruit. 



In moist woods and thickets, Maine to Min- 

 nesota. Georgia and Missouri. Ascends to 3000 

 ft. in Virginia. May-July. 



