Cymodoceaceae
絲粉藻科
特徵描述
註：依本站目前採用的分類系統，本科部分屬在《Flora of Taiwan》中分屬不同科，因此以下依植物誌使用的科名分列特徵描述。
[ Potamogetonaceae 眼子菜科 ]
作者
YANG, Yuen-Po
型態特徵
Submersed freshwater herbs. Roots fibrous, from the lower nodes. Stems terete or slightly compressed. Leaves biseriate, alternate or rarely opposite, often two types on same plant: submersed leavesusually sessile; floating leaves linear or lanceolate, leathery, petiolate, lanceolate to ovate or elliptic. Stipules membranaceous, usually fused to form a sheath with two conspicuous veins and many small parallel veins. Spikes pedunculate, contained within stipules in bud. Flowers bisexual; perianth-segments 4, free, rounded, short clawed, valvate. Stamens 4, inserted on base of claw of sepals; anthers sessile, 2-celled, extrorse. Carpels 2-4, free, sessile; stigmas mostly sessile, slightly compressed, usually keeled; ovule solitary, attached to adaxial angle of carpel, fruiting carpel rupaceous, 1-seeded, indehiscent. Seeds without endosperm.
屬
One genus with about 100 species, cosmopolitan.
參考文獻
[ Zannichelliaceae 角果藻科 ]
作者
YANG, Yuen-Po
型態特徵
Herbs, monoecious or dioecious, submersed in fresh, brackish or salt water. Rhizomes creeping. Leaves linear, with a conspicuous midrib, alternate or opposite, or crowded at nodes, sheathing at base. Flowers unisexual, solitary, axillary, or 2-4 in cymes. Perianth segments of a few scales or absent. Staminate flowers with 1 (2 or 3) stamens; anthers 2-celled, longitudinally dehiscent; filaments slender. Pistillate flowers sessile, carpels 1-several, free; style simple, stigma capitate; ovule solitary, pendulous. Fruiting carpels sessile or stipitate, indehiscent. Seeds pendulous, endosperm absent.
參考文獻
Halodule 二葯藻屬
作者
YANG, Yuen-Po
型態特徵
Dioecious submersed marine herbs. Rhizomes creeping, branched, rooting at nodes, with a short erect stem bearing leaves. Scales 2, ovate or ellipsoid. Leaves narrowly linear, flattened, with a conspicuous midrib, toothed at apex. Sheaths compressed, auricled, ligulate, usually persistent. Flowers solitary, terminal. Staminate flowers pedunculate, consisting of unequally inserted anthers. Pistillate flowers subsessile; carpels 2, each with an entire style. Fruit globose to ovoid, subcompressed, 1-seeded.
Two species in southern Asia.
