BOTANY. | 85 
frogs. The colors and spots on the perianth sometimes give the appearance 
of the skins of quadrupeds, as the leopard and tiger. These resemblances are 
often indicated in the generic and specific names. The labellum, in some in- 
stances, displays peculiar irritability. 
Tribe 1. Cypripediee. Pollen pulpy granular. Fertile anthers two, with 
a dilated petal-like body (the third stamen) between them. Example: Cypri- 
pedium, or Ladies’ slipper, of which various American species exist. 
Tribe 2. Neottiee. Pollen powdery, in numerous minute and angled 
loosely cohering grains (forming two or four masses). Anther more or less 
parallel, with the stigma or column erect. This tribe includes the following 
sub-tribes: Cranichidee, Listeridea, Spiranthidee, Physuridee, Diuridee, 
and Thelymitridee. Examples: Cranichis, Acroea; Listera, Neottia ; Sper- 
anthes ; Goodyera; Diuris ; Epiblema. 
Tribe 3. Arethuse. Pollen, as in the last. Anther terminal, forming a 
lid over the stigma. Sepals and petals mostly erect or converging. Sub- 
tribes : Limnodoridee, Acianthidee, Caleyidea, Pogonidee, Gastrodidea, 
and Vanillidee. Examples: Chlorea, Microtis ; Acianthus, Corybas ; 
Caleya; Pogonia, Arethusa, Calopogon; Gastrodia; Vanilla. The fleshy 
pods of Vanilla planifolia and V. claviculata furnish the vanilla of the 
confectioner. 
_ Tribe 4. Ophrydee. Pollen cohering in very numerous grains, which are 
collected on a cobweb-like tissue into two large masses, and affixed to the 
glands of the stigma. Flower ringent: lips with a spur at the base beneath. 
Sub-tribes: WSerapiadee, Satyriadee, Gymnadenidea, Holothrichidee, 
Disidee, Corycidea. Examples: Orchis, Ophrys, Pachites, Gymnadenia, 
Plathanthera, Holothrix ; Disa, Forficaria; Corycium, Arnottia. 
Tribe 5. Vande. Pollen cohering in definite (two or four) waxy masses, 
furnished with an elastic prolongation (caudicle). Sub-tribes: Sarcanthidea, 
Cryptochilidee, Brassidee, Pachyphyllidee, Mavillaridee, Catasetidee, 
Notylidee, Ionopsidee, and Calanthidee. 
Tribe 6. Etpidendree. Pollen coherent, in definite waxy masses, 
furnished with a caudicle: anther terminal, opercular. Epiphytic or 
terrestrial plants. Sub-tribes: Celogynidee, Isochilidee, Leliadee, and 
Bletidee. 
Tribe 7. Malaridee. Pollen cohering in definite (four) waxy masses, 
without any connecting tissue or caudicle. Sub-tribes: Pleurothallidee, 
Liparidee, Dendrobidee, and Corallorhizidee. Examples: Microstylis, 
Liparis, Corallorhiza, Aplectrum. 
Pl. 58, 59, fig. 8, Vanilla aromatica, or Vanilla. 
OrveER 35. HypRocHaripace &, the Frog-bit Family. Flowers spathaceous, 
unisexual, rarely ¥. Perianth with a six-partite limb, the three outer 
segments herbaceous and equivalent to the calyx, the three inner petaloid 
and equivalent to the corolla. Stamens definite or indefinite, epigynous. 
Ovary adherent, one- or many-celled; ovules 00, anatropal, frequently 
attached to parietal placentas; stigmas three to six. Fruit dry or 
succulent, indehiscent, uni- or pluri-locular. Seeds numerous, exalbuminous ; 
embryo straight, radicle remote from the hilum. Floating or aquatic plants, 
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