KEY TO THE NATUHAL ORDERS. 



-63. Ovary in 4 parts; perianth superior or none xxx. Raloragea. : 



Ovary globose; perianth green, obscure, inferior Ixi. Chenopodiacece. 



Perianth conspicuous, piuk or scarious Ixii. Amarantacea. 



£i. Flowers with a distinct calyx and corolla 65. 



Flowers with but one floral envelope, often obscure 71. 



^6. Petals quite free from one another 56. 



Petals slightly or much united ^ 64. 



66. Corolla inserted beneath the ovary 57. 



Corolla inserted above the ovary, or on the calyx, at a 



distance from the base 61. 



67. Stamens numerous xiv. Mypericacece. 



Stamens 10 or fewer 58. 



68. Flowers minute or obscure ; sepals, petals, stamens, and 



carpels 3 or 4 59. 



Flowers often small, but easily defined 60. 



^9. Leaves flat; flowers sessile, solitary or in one axil only of 



a pair of leaves; pistil entire xiii. Elatinacece. 



Leaves linear; flowers pedunculate; carpels free from 



one another xxviii. Grassulacea. 



■60. Sepals, petals, and divisions of pistil 4; stamens 8 xxi. JRutacece. 



Sepals, petals, stamens, and styles 5; petals entire; fruit 



in 10 parts xviii. Linaceoe. 



Sepals and petals usually 5 ; stamens 10 or fewer ; petals 



often notched ; ovary with many seeds on a central 



placenta xi. Caryophyllacece. 



'61. Flowers large; petals numerous; leaves thick and fleshy, xxxv. Ficoidem. 



Petals 5 or 4 62. 



62. Floral tube, like a tubular calyx, free from ovary xxxii. Lythracece. 



Calyx-lobes and corolla arising above the ovary; lobes 



and petals 4 63. 



■63. Ovary short; calyx-lobes and petals short and 



greenish xxx. Halorageoe. 



Ovary long, linear; petals conspicuous, pink, rarely 



white or yellow xxxiii. Onagracece. 



64. Corolla regular or nearly so 65. 



Corolla irregular 70. 



66. Corolla arising from the calyx or floral tube below the 



ovary 66. 



Corolla and calyx-lobes arising above the ovary 69. 



66. QoroUa 4-lobed; stamens 2 to 4 67. 



Corolla 5-lobed; stamens 5 68. 



67. Corolla usually blue, split nearly to the base ; stamens 2. Iv. Scrophulariacece. 

 Corolla white, lobes short; stamens 4 1. Loganiacece. 



68. Flowers blue or pink, solitary in the leaf-axils xlvii. Primvlacea. 



Flowers white, small; calyx of 2 broad sepals xii. PortulacacecB. 



Flowers blue, white, or yellow, twisted when dry; calyx 



5-lobed li. Oentianacece. 



69. Flowers minute, solitary or clustered in. the axils; rarely 



terminal xxxix. Buhiacece. 



Flowers conspicuous, blue, terminal, solitary, on a long 



stalk xliii. Campanulaeea. 



70. Stem square; ovary of four 1-seeded parts Iviii. Labiates. 



Stem round; flowers pink, in an elongating spike; ovary 



entire, 4-seeded (p.U6.)Verbenacece. 



Stem round; flowers blu^ or yellow; ovary entire, with 



two many-seeded dells Iv. Scrophulariacece. 



71. Leaves pale green; flowers obscure,mostly terminal, and 



surrounded by an involucre of leaves ; ovary in 3 parts. Ixix. EuphorbiacecB. 



Plant not so constructed 72. 



72. Flowers sessile, generally solitary, or few together, in the 



leaf-axils, and chiefly towards the ends of the branches. 73. 



Flowers stalked, sometimes in branched clusters 76. 



