mǎ guān shí hú
马关石斛
Dendrobium maguanense Q. Xu & Z. J. Liu
物种保护
保护等级:国家二级保护
分类信息
模式标本:CHINA. Yunnan: Maguan, epiphytic on tree trunks in forests, 1350 m, 12 December 2013, Liu 7262 (holotype: NOCC!).
分类讨论:this new species is similar to Dendrobium crepidatum and D. crystallinum, but differs in having much smaller flowers, white, oblong sepals 13.0–16.0 mm × 6.0–7.0 mm, white, obovate-elliptic petals 13.0–14.0 × 50.0–60.0 mm, and an obovate lip 16.0–17.0 × 11.0–12.0 mm. The lip is yellow and its front margin is white, concave, and narrowly clawed at the base. The disk of the lip three weak longitudinal ridges, extending from base to upper apex, with only the basal callus covered by short hairs.
形态特征
形态特征:附生草本植物。茎稍下垂,圆筒状,长17.0-25.0厘米,直径6.0-8.0毫米,不分枝,节间长1.2-2.8厘米,具白色条纹的鞘。花序3个,落叶后从老茎生出,有1-2朵花;花序梗短,长2.0-3.0毫米;花苞片宽卵形,2.0-3.0毫米,先端近圆形。花梗和子房长3.0-3.5厘米。花平展,萼片和花瓣白色,唇瓣黄色,前端白色;蕊柱和药帽白色。中萼片长圆形,13.0-14.0×6.0-7.0毫米,先端近圆形;侧萼片长圆形,15.0-16.0×6.0-7.0毫米,先端锐尖;颏部长3.0-3.5毫米,先端钝。花瓣倒卵状椭圆形,13.0-14.0×50.0-60.0毫米,先端钝;唇瓣倒卵形,16.0-17.0×11.0-12.0毫米,全缘,边缘具小齿,先端圆形,有一凹陷,基部狭爪状;花盘具3纵向褶片,从基部延伸到上部先端,基部胼胝体被短毛。蕊柱1.5-2.0 mm,蕊脚3.0-3.5 mm;花粉块4,长方形,2对。
生态习性
产地:云南马关
生境:生于林中树干上。
海拔:1350米。
物候:花期4月。