作 者 ：Lan Yong-Zhen, Cheo Tai-Yien
期 刊 ：植物分类学报 1991年 1期
关键词：芸苔属新疆毛芥鸡冠菜黑芥；
Keywords:Brassica, B. xinjiangensis, B. nigra, B. celerifolia,
Abstract:
The present study deals with external morphology, chromosome number, pollen
morphology and seed anatomy of three species of Brassica in China. The results are sum-
marized as follows:
1. Brassica xinjiangensis is described as a new species based on the chromosome num-
ber n=9, and 3-4-colpate and reticulate pollen grains. In the transverse section of seed,
epidermal cells are triangular, semiterete or irregular, subepidermal cells consist of one se-
ries, palisade cells terete and equal in length. Leaves are petiolate or not; stems, sepals,
pistils and siliquae are usually covered with retrorse-pilose hairs; rostrum stout, 12 mm long.
By the above characters this species differs from others in this genus.
2. Relationship between B. nigra and B. xinjiangensis. In the former all leaves are
petiolate, and the lower part of stems and leaves usually bristly; sepals, pistils and siliquae
are glabrous; pedicels are erect and appressed to the axis of infructescence; rostrum is gra-
cile, 2.5 mm long. The chromosome number is n=8. Pollen grains are 3-colpate; the exine
is cerebroid-reticulate under SEM. In the transverse section of seeds, epidermal cells are
undulate, subepidermal cells in 1-2 series, palisade cells terete, short and unequal in length.
These characteristics are the same as reported by Koch (1833), Darlington and Wylie (1955),
Goldblatt (1981), Vaughan et al. (1971), Lan (1986).
3. Taxonomical position of B. celerifolia. It was treated as B. juncea var. celerifolia
by Tsen et Lee (1942). According to the chromosome number n=10, 3-4-colporate pollen
grains, it deserves specific rank. This species differs from B. juncea, which has the chromo-
some number n=18 and 3-4-colpate pollen grains.