中国仅存10株以下的珍稀植物调查
NO.1 普陀鹅耳枥
现仅存1株。属桦木科落叶乔木，濒危种，国家1级保护植物，中国特有种。
NO.2 绒毛皂荚
现仅存2株。豆科落叶乔木，濒危种，国家2级保护植物。
NO.3 广西火桐
现仅存3株。梧桐科落叶乔木，濒危种，国家2级保护植物，中国特有种。
NO.4 羊角槭
现仅存4株。槭树科落叶乔木，濒危种，国家2级保护植物，中国特有种。
NO.5 天目铁木
现仅存5株。桦木科落叶乔木，濒危种，国家1级保护植物，中国特有种。
NO.6 华盖木
现仅存6株。木兰科常绿乔木，稀有种，国家1级保护植物。
NO.7 滇桐
现仅存6株。椴树科常绿大乔木，濒危种，国家2级保护植物，中国西南特有种。
NO.8 膝柄木
现仅存10株。卫矛科半常绿乔木，濒危种，国家1级保护植物。
拓展阅读：
All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take up most of the water. Land plants without roots do exist, however. Those greenish-yellow lichens（苔藓）you seen on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots.
Even among the flowering plants, one finds rootless forms. These flowering plants are "the higher plants" because they evolved（进化） recently and are thus considered higher on the evolutionary scale（进化树）. In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because the place where the plant grows never rains. The plant gets its water only from the dew（露水）it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and prevents dew from forming, then the plant dies. In the southern United States and in Puerto Rico, one sees bromeliads growing high above the streets on the insulation（绝缘物）of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.
1. Wood becomes larger because of _____.
A. dead cell walls B. water entering dead cells
C. the growth of cells D. the death of cells
2. From the passage we know that the evolutionary scale is graded according to _______.
A. evolutionary cycles B. heights and depths C. time D. kinds
3. The most suitable title for this passage is "__________".
A. Absorption of water by plants B. Rootless plants
C. Plants in the desert D. Higher plants
4. All plant cells are capable of ______.
5. These flowering plants are ______ because they evolved recently and are thus considered higher on the evolutionary scale.
答案：
1. B
解析：Absorption of water by dead cell walls makes wood become larger.一句说明死去的植物变大是因为水份进入细胞，选B
2. C
解析：Even among the flowering plants， one finds rootless forms. These flowering plants are "the higher plants" because they evolved recently and are thus considered higher on the evolutionary scale.说明选C
3. A
解析：通读全文可知选A
4. taking up water
解析：All plant cells are capable of taking up water. 原句
5. the higher plants
解析：These flowering plants are "the higher plants" because they evolved recently and are thus considered higher on the evolutionary scale一句得到答案