Family 17. IRIDACB^. Herbs, with radical or 
equitant lea., perennating by rhizomes or corms. 
Flow. ^ , actinomorphic or + zygomorphic, ter- 
minal or C3rmose. Resembling amaryllidace^ in 
their inferior ovary, but sta. always 3 + 0, epiphyl- 
lous. Styles often divided or 4- leaf-like. Fr. a 
loculicidal capsule. 
Crocus, Romulea { = Trichonema), Iris, Sisyrin- 
chium. Gladiolus, [Tritonia {z=Montbretia)yIxia, 
Freesia, Tigridia, Sparaxis.'j 
Order 7. MICROSPERM/E. 
Flow, cyclic. Per. 3 + 3. Sta. usually much 
reduced. Ovary inferior, 3- or i-celled, with 00 
very minute ovules. (In the only British suborder, 
Gyuandrce, the flow, are always zygomorphic and. 
the seeds exendospermous.) 
Family 18. ORCHIDACE^. Perennial herbs. 
Flow. usually twisted through 180° (resupinate) . 
Per. petaloid. Sta. i or 2, gynandrous; pollen 
usually cohering in masses (pollinia). Ovary i- 
celled ; ovules on projecting parietal plac. Fr. a 
capsule. 
Floral formula: P34-3, A0+2 or I + O, G( 3 ). 
(Diandrous) Cypripedium; (Monandrous) Orchis, 
Ophrys, Aceras, Herminium, Habenaria, Epi- 
pactis, Cephalanthera, Epipogon, Spiranthes, 
Listera, Neottia, Goodyera, Malaxis, Liparis, 
Corallorhiza, [Vanilla, Cattleya, Lcelia, Dendro- 
bium, Odontoglossum, etc.] 
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