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In the protologue of Indocalamus semifalcatus (H. R. Zhao et Y. L. Yang) T. P. Yi, there were only parts of vegetative organs reported. Based on field population investigation, indoor stereoscopic anatomy and scanning electron microscope (SEM), its reproductive organs, complete vegetative organs and micromorphological features of the abaxial leaf epidermis, were described and illustrated herein, and its geographical distribution was also updated. The results were as follows: (1) Reproductive organ features: panicle, spikelet and spike densely white pubescent, glume, pelea and lemma both smooth and glabrous, stamens 3, anthers purple, stigmas 2, white, feathery. (2) Vegetative features: culms up to 4.5 m tall, up to 2 cm in diameter, culm sheath auricle semifalcate or weak, culm sheath erect close to culm, foliage auricle weak or absent, ligule margin with densely ciliate; both sides of leaf blade homochromatic and glabrous. (3) Micromorphologic characteristics of the abaxial leaf: stomatal apparatus invisible, eight to ten elongated papillae covered the stomatal apparatus, silica bodies saddle-shaped, micro-hairs and macro-hairs both absent. (4) The new distribution area was Guanyin Mountain of Guiyang in Guizhou. The species is the most similar to I. longiauritus Hand.-Mazz., differed by culm sheath and leaf sheath with auricles semifalcate or rare, culm up to 4.5 m tall and 2 cm in diameter. |
