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叶柄长达50厘米，约2/3为鞘所包。花叶同时；花葶侧生，穿鞘而出，高可达1米，有数枚鞘；鞘圆筒状，抱茎，生于淡黑褐色的节上，长4-14厘米；
[[File:剑叶美冠兰1.jpg|缩略图|left|250px200px|[http://www.cvh.ac.cn/cvhpic/spm-l/IBSC/0627043.jpg 原图链接] [http://www.cvh.ac.cn/spms/detail.php?id=c7ab2c43 来自植物标本馆]]]
[[File:剑叶美冠兰2.jpg|缩略图|left|250px200px|[http://www.cvh.ac.cn/cvhpic/spm-l/PE/00338991.jpg 原图链接] [http://www.cvh.ac.cn/spms/detail.php?id=fc48839e 来自植物标本馆]]]
总状花序直立，长8-10厘米，疏生8-10朵花；花苞片披针形或长圆状披针形，长6-7毫米，宽约2毫米；花梗和子房长1-1.5厘米；花黄色，直径约1.7厘米；
[[File:剑叶美冠兰3.jpg|缩略图|left|250px200px|[http://www.cvh.ac.cn/cvhpic/spm-l/PE/00338990.jpg 原图链接] [http://www.cvh.ac.cn/spms/detail.php?id=fc488429 来自植物标本馆]]]
[[File:剑叶美冠兰4.jpg|缩略图|left|250px200px|[http://www.cvh.ac.cn/cvhpic/spm-l/PE/00027260.jpg 原图链接] [http://www.cvh.ac.cn/spms/detail.php?id=085da4e3 来自植物标本馆]]]
[[File:剑叶美冠兰5.jpg|缩略图|left|250px200px|[http://img1.iplant.cn/imgf/l/1223849 原图链接] [http://www.iplant.cn/info/%E5%89%91%E5%8F%B6%E7%BE%8E%E5%86%A0%E5%85%B0?t=z 来自植物智]]]
中萼片近长圆形，长1-1.2厘米，宽约3.5毫米，先端钝；侧萼片披针状长圆形，长1.2-1.3厘米，宽约3毫米，略斜歪；花瓣近椭圆形，长9-11毫米，宽6-7毫米，先端钝；
Eulophia sooi W. Y. Chun et T. Tang ex S. C. Chen in Addenda.
Plants autotrophic, to 100 cm tall. Pseudobulb subterranean, transversely ellipsoid, ca. 4.5 × 2.5 cm. Leaves 1 or 2, present at anthesis, linear-lanceolate to ensiform, ca. 40 × 2 cm, contracted at base into a petiole-like stalk, apex acuminate; petiole-like stalk ca. 50 cm, enclosed in basal sheaths for ca. 2/3 of its length. Inflorescence racemose, to 100 cm, with several sheaths at blackish brown nodes; sheaths amplexicaul, tubular, 4-14 cm; rachis 8-10 cm, laxly 8-10-flowered; floral bracts lanceolate to oblong-lanceolate, 6-7 × ca. 2 mm, shorter than ovary, apex acuminate. Flowers yellow, small to medium-sized, ca. 17 mm in diam.; pedicel and ovary 10-15 mm. Dorsal sepal suboblong, 10-12 × ca. 3.5 mm, apex obtuse; lateral sepals lanceolate-oblong, slightly oblique, 12-13 × ca. 3 mm, apex subacute. Petals subelliptic, 9-11 × 6-7 mm, apex obtuse; lip broadly ovate, ca. 13 × 11 mm, spurred at base, 3-lobed above middle; lateral lobes incurved and loosely embracing column, subelliptic; mid-lobe ovate-oblong, 4-5 × 3-4 mm, apical margin slightly undulate, apex obtuse; disk with 5 thickened ridgelike veins on mid-lobe and with 4 suborbicular lamellae midway along lip; lamellae 2-3 mm, ca. 1 mm tall; spur conic, 2-3 mm. Column ca. 7 mm, margin narrowly winged, with a column foot ca. 1 mm. Fl. Jun-Jul.
● Grassy slopes; 1000-1300 m. W Guangxi, SW Guizhou.