6 MONOCOTYLEDONEAE 



rarely only of 3 petal-like segments. Water-plants with submerged or 



floating leaves 14. Hydrocharitaceae, 



Ovary 3-celled, rarely i-celled, but then stigmas 6. Perianth usually of 6 

 petaloid segments. Land-plants 46 



46. Ovary i-celled. Style umbrella-shaped, 6-lobed. Tacca, 36. Taccaceae. 

 Ovary 3-celled 47 



47. Ovules in each ovary-cell 2, one above the other. Flowers unisexual, regular. 



Stem chmbing 37. Dioscoreaceae. 



Ovules in each ovary-cell i, 2 side by side, or more. Flowers hermaphrodite, 

 rarely unisexual but irregular 48 



48. Perianth distinctly differentiated into calyx and corolla. Leaves toothed. 



Inflorescence spadix-like Ananas, 27. Bromeliaceae. 



Perianth more or less corolla-like 49 



49. Flowers distinctly irregular, in fascicles usually arranged in spikes or racemes. 



Stamens 5, rarely 6. Seeds with more or less mealy albumen. Leaves 



with pinnate nervation. Tall plants 39. Musaceae. 



Flowers regular or nearly so. Stamens 6 or more. Seeds with fleshy or 

 cartilaginous albumen. Leaves nearly always with longitudinal nerva- 

 tion 50 



50. Flowers soHtary, terminal. No bulb or tuber ; usually a short woody trunk. 



Placentas much projecting, thickened, shield-shaped. 



Barhacenia, 35. Velloziaceae. 



Flowers in umbels, spikes, racemes, or panicles, more rarely solitary, but 



then underground stem a bulb or a tuber. Placentas not much projecting 



and thickened. 51 



51. Ovary half-inferior, with 2 basal ovules in each cell. Anthers opening at 



the apex. Seeds with a large embryo adjoining the albumen. Flowers 



in racemes or panicles Cyanasirmn, 30. Cyanastraceae. 



Ovary inferior, rarely half-inferior, but then with more than two ovules in 

 each cell. Seeds with a small embryo enclosed in the albumen. 



34. Amaryllidaceae. 



52. (5.) Perianth wanting or simple or consisting of a calyx and a choripetalous 



corolla ; petals, if present, free, more rarely cohering at the apex or in 

 the middle, but free at the base. [Subclass Archichlamydeae.] . 53 

 Perianth consisting of a calyx and a sympetalous corolla ; petals more or 

 less united, at least at the base. [Subclass Metachlamydeae or 

 Sympetalae.] 551 



53. Perianth wanting or simple, that is, consisting of similar segments, more rarely 



of 2 — 7 somewhat dissimilar ones without a distinct differentiation 



into sepals and petals. [Apetalae.] 54 



Perianth differentiated into calyx and corolla, more rarely consisting of 8 

 or more slightly dissimilar segments not distinctly separated into sepals 

 and petals. [Choripetalae.] 188 



54. Perianth absent in the hermaphrodite and female flowers, but sometimes 



replaced by bracteoles. Ovary naked 55 



