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螺序草属(茜草科)的种子形态
引用本文:马其侠,王瑞江,胡晓颖,陈炳辉.螺序草属(茜草科)的种子形态[J].热带亚热带植物学报,2005,13(3):264-270.
作者姓名:马其侠  王瑞江  胡晓颖  陈炳辉
作者单位:中国科学院华南植物园,广州,510650
基金项目:中国科学院分类区系特别支持费(2000)资助
摘    要:对螺序草属(Spiradiclis B1、)16种2变型共18个样品的种子形态特征的初步研究表明,本属植物种子为小型(0.2—0、3mm)或中型(0.3—2mm),整体形状不太规则,表面纹饰为蜂窝状,种脐稍突出。种子的外壁由内外2层种皮组成。依据表面突起分布方式,螺序草属的种子大致分为2种类型:(1)平周壁微下陷,疣突均匀分布于其上,如大叶螺序草、螺序草、尖叶螺序草、柳叶螺序草、峨嵋螺序草和龙州螺序草;(2)平周壁下陷成穴状,突起分布在穴边缘,如红花螺序草、心叶螺序草、两广螺序草、广东螺序草、海南螺序草、宽昭螺序草、疏花螺序草、多枝螺序草、罗氏螺序草、小叶螺序草、石生螺序草和紫花螺序草。螺序草属的种子形态特征对属下类群的划分具有重要的参考价值。

关 键 词:螺序草属  种子形态  茜草科
文章编号:1005-3395(2005)03-0264-07
修稿时间:2004年4月9日

Seed Morphology of Spiradiclis Bl. (Rubiaceae)
MA Qi-xi,WANG Rui-jiang,HU Xiao-ying,CHEN Bing-hui.Seed Morphology of Spiradiclis Bl. (Rubiaceae)[J].Journal of Tropical and Subtropical Botany,2005,13(3):264-270.
Authors:MA Qi-xi  WANG Rui-jiang  HU Xiao-ying  CHEN Bing-hui
Abstract:The seeds of 18 taxa including 16 species and 2 forms of genus Spiradiclis Bl. were examined. The seeds of Spiradiclis have small (0.2-0.3 mm) or medium size (0.3-2 mm), irregular shape, alveolate surface, slightly prominent hilum. Seed testa consists of exotesta and endotesta. The projections on periclinal wall of epidermis cells can be classified into two types: the projections are either distributed consistently on slightly concave periclinal walls, which can be seen in 6 taxa, viz.: S. bifida, S. caespitosa, S. caespitosa f. cylindrca, S. caespitosa f. subimersa, S. emeiensis and S. longzhouensis, or around the fovea formed by deeply concave periclinal walls, which can be found in 12 taxa, viz.: S. coccinea, S. cordata, S. fusca, S. guangdongensis, S. hainanensis, S. howii, S. laxiflora, S. leptobotrya, S. loana, S. microphylla, S. petrophila and S. purpureocaerulea. The seed morphology in Spiradiclis can play an important role in distinguishing infra-genus taxa.
Keywords:Spiradiclis  Seed morphology  Rubiaceae
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