OBCHIDACEAE. 49 



Order ORCHIDALES. 



Terrestrial, aquatic, or epiphytic herbs. Leaves usually fleshy, some- 

 times scale-like. Flowers mostly perfect and complete, very irregular, 

 except in BURMANNIACEAE. Calyx of 3 sepals. Corolla of 3 petals. 

 Gynoecium compound. Ovary inferior. Seeds numerous. Endosperm 

 wanting. 



Flowers regular : stamens and pistil distinct. Fam. 1. BURMANNIACEAE. 



Flowers irregular : stamens and pistil united into a column. Fam. 2. OBCHIDACEAE. 



FAMILY 1. BURMANNIACEAE. BURMANNIA FAMILY. 



Slight or relatively small herbs. Leaves mainly basal, those on the 

 stem scale-like. Flowers regular. Sepals and petals partially united. 

 Androecium of 3 or 6 stamens: filaments adnate to the perianth-tube. 

 Gynoecium 3-carpellary. Fruit capsular, sometimes angled or winged. 



1. BURMANNIA L. Annual herbs. Flowers spreading or erect, short- 

 pedicelled, white or blue. Filaments unappendaged : connective prolonged 

 beyond the anthers. 



Flowers 1-several, often 2, in a terminal raceme : hypanthium broadly 3-winged. 



1. B.biflora. 

 Flowers several in a terminal cluster : hypanthium 3-angled. 2. B. capitata. 



1. B. biflora L. Stems 5-15 cm. tall: leaf-scales 1-3 mm. long: flowers 

 solitary at the top of the stem, or 2-few together: corolla-lobes narrow: cap- 

 sules 4-5 mm. long. Everglades and low pinelands. 



2. B. capitata (Walt.) Mart. Stems 5-20 cm. tall: leaf -scales 1-5 mm. long: 

 flowers several or many in a terminal cluster: corolla-lobes obsolete: capsules 

 2-3 mm. long. Everglades and low pinelands. (Cuba.) 



FAMILY 1. ORCHIDACEAE. ORCHID FAMILY. 



Perennial mostly succulent herbs. Leaves basal or cauline, often 

 sheathing at the base. Flowers very irregular. Sepals 3, 1 median, 2 

 lateral. Petals 3, 1 median often greatly specialized ("lip")', 2 lateral 

 (petals). Androecium of 1 or more stamens adnate to the style, the 2-8 

 pollinia waxy or powdery. Gynoecium of 3 united carpels, the ovary 

 twisted. Fruit capsular. 



Lip with a long slender spur : pollinia developing tails at the base of the anther 

 which are connected with the glands of the rostellum ; filament very short and 

 broad : anther persistent. 

 Base of the anther with long slender appendages : lip and petals parted, or 



lobed at the base. 



Lip 3-parted : petals 2-parted : stigmas erect. 1. HABENABIA. 



Lip obscurely lobed at the base: petals lobed on 



one side at the base : stigmas drooping. 2. HABEXELLA. 



Base of the anther without appendages : lip and petals 



neither parted nor lobed. 3. GYMNADENIOPSIS. 



Lip spurless, sometimes saccate: pollinia without tails (or 

 they are rarely developed) : filament mostly thin and 

 brittle, the anther therefore usually deciduous. 

 Flowering stem terminal. 



Leaves convolute in the bud. 



Anther generally rounded or very blunt, usually 



much exceeding the rostellum. 

 Lip not enclosing the column : blade 3-lobed 

 at the apex : flowers erect : seed not covered 

 with a crust : low herbs. 4. CABTEBIA. 



Flora of Miami 4 



