Aquatic or semi-aquatic herbaceous plants. Leaves alternate, basal-like, often dense near the top of the rhizomes or stolons was usually base expanded and sheathing. Inflorescence cymose umbrella, a racemose or panicles, sometimes solitary; neat flower base (majority), bisexual or unisexual; perianth 6, arranged in two outer 3 was calyx-like, the inner ring 3, petal-like; pistil 3 - 20 free (or base joint), arranged in a spiral arrangement. The head including to spend Lin Branch (Butomaceae) Alismataceae 3 families. The water turtle head (Hydrocharles) The purpose is just a subject, Hydrocharitaceae, morphological characteristics of the same family. Hydrocharitaceae (Hydrocharitaceae) Perennial (rarely annual) the floating, or Shen plants this, raw fresh or salt water. Stem or none. The leaf ro_set_te sometimes, sometimes two, alternate, born to whorled, or elbow differentiation lanceolate, oval or heart-shaped oval leaves and petioles. Flowers solitary, in pairs or arranged in inflorescences like, often spathe-like bracts or the bracts raw packet; usually solitary, rarely bisexual, actinomorphic; often the majority of male flowers arranged in umbrella shaped; single female flowers; tepals 1 - 2, 3 rounds, such as 2, the Ocean Shipping respect sheet, inner petals shaped, white, Qiang color, purple, blue or yellow; stamens usually majority of development to the heart, dilute 3 or 2, anthers outgoing, linear or oval; the pollen grains nearly spherical, often without colporate or monocolpate; ovary inferior, the carpel 3 - 6 (dilute 2 - 20), the same number of style and carpel, does not crack or 2-lobed, 3 - 6 Parietales the ovule majority. Fruit fleshy, berry-like, but usually irregular, or stellate cracking. Seeds of the minority to the majority, with the upright or slightly curved embryo. Chromosomes: X = 7 - 12. Bachelor 16 genera and about 100 species, mainly distributed in tropical and subtropical regions, some species are distributed in temperate. China has 9 genera and about 20 species, mainly produced in southern. The entry only betel nut Branch, morphological characteristics of the same family. Betel nut Division (Arecaceae) palm (Palmae)] Tree or shrub, upright alone, unbranched, rare for Fujimoto. Evergreen leaves, shaped, alternate, palmately lobed or pinnate, bud inward or outward folding, _set_ born tree at the top to form a "palm" canopy or climbing species scattered. Petioles often expanded into a fibrous sheath. Flowers small, usually yellowish green, bisexual or unisexual, the same strain or different strains, basically 3 base, neat or sometimes slightly irregular, composed of branched or unbranched spadix, outside the 1 to the number of pieces large shaped Buddha flame-like involucre wrapped, was born in foliage or sheath beam; tepals 6, arranged in two separate or connate; stamens 6,2 round, rare for 3 or more filaments separation or the base joint ring, anthers 2; the carpel 3, separation or varying degrees of joint; pollen nuclear Most monocolpate, also with 3-channel or ditch, or 2 holes; ovary superior 1 - 3 rooms , dilute 4 - 7 rooms, every room has an ovule; style short, stigma 3. The fruit is a drupe or berry, exocarp fleshy or fibrous, sometimes covered imbricate scales. Seeds with endocarp separation or bonding, endosperm, homogeneous or ruminate. Chromosomes: X = 13 - 18. Approximately 212 genera and more than 2780 species, distributed in tropical and subtropical to tropical America and tropical Asia distribution center. China has 22 genera (including cultivation), about 72 species, mainly distributed in the south to the south-eastern provinces, mostly for important fiber, oil, starch and ornamental plants.
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