296 SYSTEMATIC BOTANY. 



young ; scales of the ament cut into several small, unequal segments, scarce- 

 ly fringed with hairs. A large tree. April. 



3. P. DILATATA (Lombardy Poplar). Leaves deltoid, acuminate, smooth, 

 serrate, as broad as long ; trunk furrowed. A tall tree, of regular, pyramidal 

 growth. April. 



SUPERIOR ENDOGENS. 

 Order LXXIX. ORCHIDACE^E (Orchid Family). 



Perennial, often acaulescent herbs. Leaves simple, entire, par- 

 allel-veined. Flowers very irregular. Perianth of 6 segments, all 

 usually colored, and assuming various forms, especially the lowest 

 of the 4 inner segments, or lip, which is often spurred. Stamens 

 3, consolidated with the style into a column, only the central one 

 fertile ; sometimes the two lateral ones fertile, and the central one 

 abortive. Pollen sometimes granular and powdery, but more com- 

 monly cohering in wax-like masses, which are usually attached 

 to a gland of the stigma. Ovary twisted, adherent to the tube 

 of the perianth, I -celled, many-ovuled. Fruit a 3-ribbed, 3-valved 

 capsule. 



Anthers 

 one, 2- 

 celled- ^ 



( Stigma-glands hooded Ore/its. 

 Lip with distinct spur 



Lip 



[Stigma-glands not hooded Habenaria. 

 f Flowers one Arethusa. 



without bearded ~ | Flowers one or f Pollen-masses -Caloj>ogon. 



:..: I I more -I 



[Pollen-masses 2 Pogonia. 



distinct 

 spur- 



Lip not green 



Plants r Leaves variegated Goody era. 



bearded -I [Leaves not variegated Spiranthes. 



O 



[Plants not green Corallorhiza. 



Anthers 2 Cypripedium. 



1. Corallorhiza. Sepals and petals nearly equal ; lateral ones 

 erect ; upper vaulted. Lips spreading and recurved, usually produced 

 behind into a short spur, which adheres to the top of the ovary. Pol- 

 len-masses 4, oblique to each other. Leafless. 



C. MULTIFLORA (Coral-root}. Scape many-flowered ; lip cuneate, oval, 

 3-lobed, spotted with bright purple ; middle lobe recurved, much longer than 

 the lateral, tooth-like lobes ; spur conspicuous ; capsule and ovary oblong. 

 A leafless plant, i2'-i8' high, with a brownish-purple scape, probably para- 

 sitic on the roots of trees. July-August. 



2. Orchis. Flower ringent. Sepals and petals nearly equal, most 

 of them converging and vaulted. Lip depressed, attached to the base 



