320 PATAGONIAN EXPEDITIONS I BOTANY. 



(Chili) ; Magellan, and W. Magellan (Dusen) ; Fuegia to Cape Horn. 

 Extends farther S. and to greater elevations than the species of Sisyrin- 



chium. Moist meadows, especially on 

 FIG. 57. 



mountains. 



Family 2 1. ORCHIDACE^:. 

 Orchid Family. 



Perennial, tuberous, or rhizomatous, 

 or epiphytic herbs, with entire sheath- 

 ing leaves, and superior perfect, zygo- 

 morphous, showy flowers. Perianth 



Tapcinia magellanica. "Leafage, flower, 2-SCriate (calyx and COrolla both peta- 



seed, and dehisced capsule. (After Flora l o id), each 3~leaved ; the SCpttls all simi- 

 antarctica.') . , , . . . . , . 



lar ; the 2 lateral petals or ' wings simi- 

 lar ; the third petal becomes anterior by torsion, and forms a labelhim, 

 being also frequently spurred. Stamens 1-2, gynandrous ; only I, rarely 

 the two, antheriferous ; pollen cohering in 2-8 pear-shaped masses. Ovary 

 inferior, i -celled, with 3 parietal placenta, often long and twisted, \\sstyle 

 united with the staminal column in a gynandrium, forming a stigmatic ros- 

 trum. Seeds exceedingly numerous and minute, having no endosperm. 

 Species 5,000, abounding most in the tropics. 



KEY TO THE GENERA. 



1. Single leafy stem with a terminal spike or raceme. Chloraa. 



2. Leaves whorled about midway on a i -flowered scape. Codonorchis. 



i. CHLOR./EA Lindl. (Including Asarca Lindl.) 

 Anther i, erect behind the rostrum, 2-celled, and each cell partially 2- 

 celled. Pollinia 2-parted, oblong. Rhizomes bearing simple leafy stems 

 with flowers on a terminal spike or raceme. Posterior sepal sometimes 

 erect, arched. Petals narrow, the labellum incurved, ascending from the 

 base of the column, spurless, open on the upper side, and sometimes 

 with 2 calli. 



Species 80, confined to extratropical S. Amer. 



KEY TO THE SPECIES. 

 A. Stem leafy. 



b. Leaves dimorphous ; the basal narrow-lanceolate, long-petiolate ; the upper broad and 

 sheathing. Flowers large and whitish. bugainvilleana. 



