亚洲免费av电影一区二区三区,日韩爱爱视频,51精品视频一区二区三区,91视频爱爱,日韩欧美在线播放视频,中文字幕少妇AV,亚洲电影中文字幕,久久久久亚洲av成人网址,久久综合视频网站,国产在线不卡免费播放

        ?

        Introduction of the Plant Front Cover: Gymnocarpos przewalskii

        2022-12-17 05:37:56GAORunhong,YANGHaifeng
        西北植物學(xué)報(bào) 2022年5期

        GymnocarposprzewalskiiBunge ex Maxim. belongs to Gymnocarpus of Caryophyllaceae, a rare and endangered ancient Mediterranean relict plant, alias ‘a(chǎn)chene caryophyllum’, Perennial deciduous subshrub, 50-100 cm tall. Leaves linear, 5-20 long and 1-1.5 mm wide, sessile, acute apex, contracted base, fleshy, waxy layer on surface, glabrous, no obvious veins. Stipules membranous, scaly. Opposite or alternate leaves. Stems exist in two forms, erect or tortuous, with inflated nodes and multi-branch. The bark of old branches is gray-brown and cracked, young branches red-brown. Hermaphrodite flowers with red and yellow-green colors, petals absent, outer transparent white bracts covered. 5 sepals with lanceolate, apex awned, wide transparent membranous margin, covered pubescent. 10 stamens, 5 for each of the inner and outer rounds, in which only the inner stamens have anthers, and the outer anthers are aborted, anther ellipsoid, longitudinally dehiscent. Superior ovary, subglobose, 1 ovule; Cymes axillary, composed of 5-15 single flowers, approximate 4 days flowering period for single flower and 30-36 days for population. Achenes persistent. Small, brown and oblong seeds, ca. 0.5 mm in diameter, low seed setting rate. Obvious taproot, ca. 4 m long, well-developed lateral root with less root hair. Flowering from May to June and fruiting from July to August.

        Gymnocarposprzewalskiiis endemic species in China, mainly distributed in Xinjiang, Gansu, Hexi Corridor, central and western Inner Mongolia, Ningxia, Qinghai and other places, which was identified as National first-class key protected plants in 1997. This species has the characteristics of drought, wind erosion and sand burial resistance, salt-alkali and barren tolerance. It is one of the important constructive species in rocky desert areas, and has positive effects on preventing soil desertification and maintaining ecosystem balance in desert areas. Meanwhile, as a rare relict species of the ancient Mediterranean xerophytic flora in the desert region of central Asia, it has very important scientific value for researching the formation, development, climate change of deserts and floristic origin of xerophytes in northwest China.

        (GAO Runhong, YANG Haifeng)

        精品人妻一区二区三区蜜桃| 大肉大捧一进一出好爽视频| 亚洲一二三四区免费视频| 女人被男人爽到呻吟的视频| 国产日韩精品中文字无码| 国产激情视频在线观看首页| 精品国产一区二区三广区| 国产精品主播在线一区二区| 欧美黑人xxxx又粗又长| a在线免费| 中文字幕一区二区三区喷水| 午夜少妇高潮在线观看| 一区二区三区在线 | 欧| 久久久久亚洲av成人网址| 亚洲国产丝袜美女在线| 国产一区二区黄色录像| 久久和欧洲码一码二码三码| 国产精品久久久久…| 伊人久久亚洲综合av影院| 极品粉嫩嫩模大尺度无码视频 | 男女高潮免费观看无遮挡| 久久久国产精品麻豆| 亚洲人av毛片一区二区| 亚洲视频免费一区二区| 国产av永久无码天堂影院| 成人xx免费无码| 少妇高潮免费在线观看| 亚洲日韩精品无码av海量| 人妻少妇偷人精品无码| 女同啪啪免费网站www| 国产精品久久夜伦鲁鲁| 老女老肥熟女一区二区| 久久婷婷成人综合色| 日本a在线天堂| 少妇下面好紧好多水真爽| 国产偷久久久精品专区| 欧美精品黄页在线观看视频| 成人激情视频一区二区三区| 2019nv天堂香蕉在线观看 | 国产91精品在线观看| 777精品久无码人妻蜜桃|