62 ORCHIDACEAE 



2. Fertile stamen solitary, the 2 anther-sacs sometimes widely separated 



a. Native plants with small and inconspicuous flowers 



(1) Stems leafy; lip not sack-like, appendaged at base Spiranthes 



(2) Leaves all basal ; lip sack-like Epipactis 



b. Greenhouse plants of tropical origin ; flowers large and conspicuous ; 



mostly growing with little earth, and having thick leaves, aerial 

 roots, and thickened tuberous stems (pseudo-bulbs). 



(1) Flower clusters terminal upon the pseudo-bulbs; chambers of 



anther distinct 



(a) Lip flat and spreading; pollen masses 4; flower clusters usually 



many-flowered Epidendrum 



(b) Lip rolled about the base of the column; flower clusters few- 



flowered 

 x. Pollen masses 4 Cat/leva 



y. Pollen masses 8 Laelia 



(2) Flower clusters not terminal upon the pseudo-bulbs 



(a) Flowers borne singly or in small clusters upon the sides of the 



pseudo-bulbs Dendrobium 



(b) Flowering shoots springing from the base of the pseudo-bulbs ; 



chambers of anther confluent 

 x. Base of lip parallel with the column, often adhering to it Odontoglossutn 



y. Lip spreading from the base of the column Oncidium 



Cvpripedium 



' (Gr. Kypris, Venus, pedilon, slipper, from the slipper-like lip) 

 A genus compromising our native "Mocassin flowers" as well as many exotic forms. 

 Flowers green, brown, and white C. insigne 



Spiranthes 



(Gr. speira, spiral, anthos, flower, from the spiral cluster) 



1. Sepals and petals forming a hood-like structure S. romanzoffiana 



2. Sepals and petals spreading S. cernua 



Epipactis 



(Gr. name of a plant) 

 Leaves white netted ; lip sack-like E. pubescens 



Epidendrum 



(Gr. epi-, upon, dendron, tree, from its habit) 



1. Base of lip slightly joined to the column; flowers red and orange E. viiellinum 



2. Base of lip completely joined to the column ; flowers pink, green, and 



chocolate E. venosum 



Cattleya 



(Named for Cattley, an English collector) 



1. Pseudo-bulbs 1-leaved; flowers 15 cm. in diameter ('. labidia 



2. Pseudo-bulbs 2-3 leaved ; flowers about 10 cm. in diameter ('. Skinneri 



Laelia 



(Named for Laelius, a Roman statesman) 



1. Pseudo-bulbs compressed and margined ; sepals and petals with a green 



line along the outside of the midrib L. dnccps 



2. Pseudo-bulbs not compressed or margined ; sepals and petals not marked 



with a green line L. autumnalis 



Dendrobium 



(Gr. dendron, tree, bios, living:, from its habitat) 



1. Pseudobulbs black-hairy; flowers white, marked with yellow D. jormosum 



2. Pseudo-bulbs not black-hairy ; flowers white, pink, and crimson D. nubile 



