OR CHID A CEA £. 29 1 



Sepals and petals longer than the lip. 



Sterile stamen lanceolate ; lip white. 4. C. candidtitn. 



Sterile stamen triangular; lip yellow. 



Lip 3-5 cm. long, vertically flattened, pale yellow. 5. C. hirsutum. 



Lip 1.5-3 cm - l° n S' laterally flattened, bright yellow. 6. C. pai-viflorum. 



1. Cypripedium arietinum R. Br. Ram's-head Ladies' Slipper. (I. F. f. 

 1088.) Stem 2-3 dm. high, i-flowered. Leaves 3 or 4, elliptic or lanceolate. 5-10 

 cm. long. 1-7 cm. wide; sepals separate, lanceolate, longer than the lip; petals linear, 

 greenish brown, al)out as long as the sepals ; lip 14-16 mm. long, red and white, 

 veiny, prolonged at the apex into a long blunt spur, somewhat distorted at the upper 

 end which resembles a ram's head. In cold and damp woods, Quebec to Out., 

 N. V. and Minn. May-Aug. 



2. Cypripedium acaule Ait. Moccasin Flower. Noah's Ark. Stem- 

 less Ladies' Slipper. (I. F. f. 1089.) Scape 1.5-3 dm. high, i-flowered. Leaves 

 2, basal, elliptic, 15-20 cm. long, thick ; occasionally a smaller leaf is borne on 

 the scape ; sepals greenish purple, spreading, 3-5 cm. long, lanceolate ; petals 

 narrower and somewhat longer than the sepals ; lip often over 5 cm. long, pink 

 with darker veins or sometimes white, the upper part of its interior surface crested 

 with long white hairs; sterile stamen triangular, acuminate, keeled inside. In 

 sandy or rocky woods, Newf. to Ont., N. Car., Ky. and Minn. Flower fragrant. 

 May-June. 



3 Cypripedium reginae Walt. Showy Ladies' Slipper. (I. F. f. 1090.) 

 Stem stout, 3-6 dm. high, leafy to the top. Leaves elliptic, acute, 7-18 cm. long; 

 flowers 1-3; sepals round-ovate, white, not longer than the lip, the lateral ones 

 united for their whole length; petals somewhat narrower than the sepals, white; 

 lip much inflated, over 2.5 cm. long, variegated with purple and white stripes; 

 stamen cordate-ovate. In swamps and woods, N. S. to Ont. and Minn., south to 

 Ga. June-Sept. 



4. Cypripedium candidum Willd. Small White Ladies' Slipper. (I. F. f. 

 109 1.) Stem 1.5-3 dm. high> leafy. Leaves 3 or 4, elliptic or lanceolate, acute 

 or acuminate, 7-12 cm. long; bracts 3-5 cm. long, lanceolate; flower solitary ; sepals 

 lanceolate, longer than the lip, greenish, purple-spotted; petals somewhat longer 

 and narrower than the sepals, wavy, twisted, greenish; lip white, striped with 

 purple inside, about 2 cm. long; sterile stamen lanceolate. In bogs and meadows, 

 N. V. and N. J. to Minn., Neb. and Mo. May-July. 



5. Cypripedium hirsutum Mill. Large Yellow Ladies' Slipper. (I. F. f. 

 1092.) Stems leafy, 3-6 dm. high. Leaves oval or elliptic, 7-12 cm. long, acute 

 or acuminate; sepals ovate-lanceolate, usually longer than the lip, yellowish or 

 greenish, striped with purple; petals narrower, usually twisted; lip much inflated, 

 2-5 cm. long, pale yellow with purple lines; sterile stamen triangular. In woods 

 and thickets, N. S. to Ont., Minn., Ala. and Neb. May-July. 



6. Cypripedium parviflorum Salisb. Small Yellow Ladies' Slipper. 

 (I. F. f. 1093.) Stems 3-6 dm. high, slender, leafy. Leaves oval, elliptic or 

 lanceolate, 5-15 crn. long; sepals and petals longer than the lip; petals usually 

 twisted; lip 14-30 mm. long, bright yellow, more or less marked with purple 

 stripes, spots or blotches; sterile stamen triangular, yellow and purple spotted like 

 the lip. In woods and thickets, Newf. to Br. Col., Wash., Ga. and Mo. May- 



July. 



2. ORCHIS L. 



Plants with biennial fleshy tubers, or in our species with a rootstock and numer- 

 ous fleshy roots; stem in our species scape-like, I -leaved at the base. Flowers in 

 short terminal spikes. Sepals separate, subequal, spreading. Petals similar to the 

 sepals. Lip connate with the base of the column, 3-lobed, produced below into a 

 spur. Column short, scarcely extending beyond the base of the lip. Anther 

 2-celled, the sacs contiguous and slightly divergent; pollinia granulose, 1 large 

 mass in each sac. produced into a slender caudicle, the end of which is attached to 

 a small gland. Stigma a hollowed surface between the anther-sacs, the rostellum a 

 knob-like projection under the anther. Glands enclosed in a pouch. Capsule ob- 

 long, erect, without a beak. [Name ancient.] About 80 species, natives of the 

 north temperate zone, only two known in N. Am. In habit the following differs 

 somewhat from the typical Old World species. 



