26 Spring Flora of Ohio. 



IX. Order OR-CHI-DA'-CE->E. ORCHIS FAMILY.— Flowers perfect, 

 irregular ; ovary inferior, ovules innumerable ; pistil and stamens 

 united into a column; pollen tisually in masses with a pedicel; the 

 lower modified petal is called the lip. 



Plants leafless, brownish, yellowish, or purplish c . 



Plants with one or two leaves, not evergreen b . 



Plants with one leaf, persistent through the winter d . 



Plants with leafy stems a . 

 a. Flowers solitary or terminal or a few axillary, lipcrested b . 

 a. Flowers terminal, the lip a very large inflated sac Cypripcdium. 1 



b. F'lowers in spikes, showy ; fleshy fibrous roots Orchis. 2 



b. Flowers in spikes and otherwise like the preceding except that the 

 two glands or viscid disks on the column formed by the union of 

 the pistil and stamens are not enclosed in a common pouch, but 

 are approximate or widely separated Habetiaria. 3 



b. Flowers solitary^, terminal or a few axillary, root fibrous or with 



oblong tubers Pogonia. 4 



c. Root-stocks much-branched and toothed coral-like Coiallorhiza. 5 



d. The 3 or 4 corms connected horizontally Aplectrum. G 



1. Genus CYP-RI-PE^-DI-UIVI. — Lip a very large inflated sac; leaves 

 large, many-nerved and plaited, sheathing at base. 



A. Stems leafy. 



Cyp-ri-pe'-di-um can'-di-dum Willd. White Lady's Slipper. — L,ip white, 

 striped with purple inside. 



Cyp-ri-pe'-di-um par-vi-flo'-rum Salisb. Yellow Lady's Slipper. — Lip 



bright vellow, flattish from above, 1 in. long or less. 



Cyp-rf-pe'-di-um hir-su'-tum Mill. (C. pubcscens Willd.) Larger Yel- 

 low Lady's Slipper. — Lip pale yellow, flattened laterally, very convex 

 and gibbotis above, 1^-^-2 in. long. 



A. Scape )iaked, '1-Ieaved at base. 



Cyp-ri-pe'-di-um a-cau'-le Ait. Stemless Lady's Slipper. — Scape 8-12 

 in. high with a green bract at top; lip rose-purple, rarely white, droop- 

 ing, a fissure in front. 



2. Genus OR'-CHIS. — Flowers ringent, showy, in a spike, the lip 

 tinned downward ; the two glands or sticky disks of the stigma in a 

 pouch or hooded fold. 



Or'-chis spec-tab'-il-is L. Showy Orchis. — Leaves 2, oblong obovate ; 

 the lip undivided. 



