SECT, II 



PHANEEOGAMIA 



489 



one continues rudimentary or develops as a rostellum. Orchis, with spurred 

 labellum ; Ophrys, without spur, the flower resembling an insect ; both genera, 



Pig. 433.— Root-system of Orcliis latifolia. b, 

 Base of stem ; s, cataphyllary leaf ; if old, 

 *" young tubers ; k, bud ; r, roots. 



Fig. 434. — Root -system of Orchis morio.— 

 Officinal. (After Wossidlo, nat. size.) 



and similarly Gymnadenia, Platanthera, and others, with tubers ; Cvphalamtliera 

 and Epipactis, with creeping rhizome. Neottia, Epipogon, and Coralliorrhiza are 



Fig. 435. — Gongora, galeata, an epiphytic 

 orchid. (After Pfitzer in Nat. 

 Pflanzenfamilien, £ nat. size.) 



Fig. 436. — Vanilla planifolia. 1, Inflorescence ; 2, 

 fruit. — Officinal. (After Berg and Wossidlo.) 



humus plants, either poor in chlorophyll or wholly devoid of it. Vanilla (see 

 under Officinal). 



Geographical Distribution. — This family inhabits chiefly the Tropics, where 

 thousands of its species are found growing as epiphytes upon trees. The roots of 

 such epiphytes (Fig. 435) attach themselves to the bark and are enveloped by a 



