. The natural history of plants. Botany. 442 NATURAL HISTORY OF PLANTS. Ammannia {Rotala) verticillaris. portula, hut has generally a tetramerous and tetrandrous flower.' The true Ammannias, more confined to the warm regions of hoth worlds, often have the tetramerous flower of DidipUs, with or without petals and with the accessory teeth of the calyx more or less deve- loped. ' In some cases the flower has as many as seven parts; in others again, there are only three, as in Botala^ (fig. 423, 424). The length of the style varies much also between one species and another. The stamens may be the
. The natural history of plants. Botany. 442 NATURAL HISTORY OF PLANTS. Ammannia {Rotala) verticillaris. portula, hut has generally a tetramerous and tetrandrous flower.' The true Ammannias, more confined to the warm regions of hoth worlds, often have the tetramerous flower of DidipUs, with or without petals and with the accessory teeth of the calyx more or less deve- loped. ' In some cases the flower has as many as seven parts; in others again, there are only three, as in Botala^ (fig. 423, 424). The length of the style varies much also between one species and another. The stamens may be the same in number as the sepals or double, or even less in num- ber. Suffrenia (fig. 420^422), like Didiplis, may have only two stamens; and the petals, when they exist, are either very small or moderately de- veloped. The dry fruit may open regularly, like every septicidal or septifragal capsule : this is the case in Botala, Saffrenia, and Ame- letia;^ but it may also open transversely or irregularly, as in DidipUs and Gryptotheca.^ It is on these variations that the three * sections we admit in the genus Ammannia are founded. This genus comprises about thirty-five species,^ annuals or evergreens, often aquatic, with opposite or verticillate, rarely alternate leaves, axillary solitary flowers, accompanied by lateral bracteoles which are fertile when, the flowers are collected in cymes or few-flowered glome- Fig. 423. Flower (4). Fig. 424. Long, sect, of flower. 1 It may be diandrous. The sepals are some- times five or six in numter. The petals are wanting, as is often the case in Peplis Portula, and the accessory teeth of the calyx are as marked as in the latter. 2L. Mantias. 175.—DC. Prodr. iii. 16.— MSm. Mus. ii. 381.—Endl. Gen. u. 6143. —f Ortegioides Soland. (ex Endl.).—Entelia E. Be. (ex Endl.).—Tritheca Wight and Akn. Prodr. i. 305. 3 DC. Mlm. Genhv. iii. p. ii. 82, t. 3 ; Prodr. iii. 76.—Endl. Gen. n. 6146.—Bitheea Wight and Akn. Prodr. i.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1871
