Order 138.— THE ORCHIDS. 289 



3. COKALLORHrZA. Coral-root. Dragon's-claw. 



Flower ringent Sepals and petals similar, ascending, the upper arch- 

 ing. Lip produced behind into a short spur, which grows closely to the 

 ovary. Pollen-masses 4, oblique. — Herbs without green herbage, leafless, 

 with coraline roots, and spikes of dull-colored flowers. May-Sept. 



1 Spur imperceptible. Lip not lobed, often with 2 teeth at base 2, 3 



1 C. multiflo'rzL Many -flowered C. Spur manifest. Lip 3-lobed (the side lobes 

 small), spotted. Flowers 10-20, purple. Height 10-15^ 



2 O. odontorhi'za. Dragon'' s-claio. Flowers 9-18, purple. Lip orenulate, spotted. 



Ovary and pod nearly globular. Scape 9-14''. 



3 O. inna^ta. L(sser C. Flowers 5-10, purplish. Lip obscurely 2-toothed near the 



base, spotless. Ovary and pod club-shaped. 5-6''. 



4. ARETHU'SA. 



Sepals and petals cohering at base, similar, ascending, arching. Lip 

 spurless, deflexed at the end, bearded inside, cohering to the petal-like 

 column at base. Anther terminal, closing the 2 pollen cells like a lid. 

 Pollen-masses 2 in each cell. — Small plants, 1 -flowered, in wet places. 

 Leaves none, or hidden in the sheaths. 



A. bulbo'sa. A beautiful plant 6-12'' high, invested with about 3 long loose sheaths 

 with lanceolate points (hardly leaves). At the top is a large, fragrant purple 

 flower, in June. (See Figs. 651, 652.) 



5. SPIRANTIIES. Ladies' tresses. 



Flowers in a spiral spike, somewhat ringent. Petals and sepals nearly 

 erect, all tending to the upper side opposite the lip. Lip raised on a short 

 claw, concave, entire, widened at top and furnished with 2 callous pro- 

 cesses at-base. Column arching, pollen-masses 2. — Stem leafy below or 

 nearly naked, bearing a spike of small, white flowers, which are bent 

 sideways and horizontal. July-Oct. (Fig. 240.) 



* Fls. in a single row on one side, and but little twisted. Lvs. radical 1, 2 



* Fls. in several rows all around the short spike. Lvs. on stem below. . . .8, 4 



1 S, grac''ilis. Slender L. Leaves ovate, varying to lance-oblong. Lip obovate, 



wavy-crisped. 



2 S. tor 'tills. Twisted L. Leaves linear, early withering (like firet). Lip 8-lobcd, 



finely crenate. 



13 



