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拉丁学名:Lagerstroemia glabra (Koehne) Koehne 界:植物界 门:被子植物门 Angiospermae 纲:双子叶植物纲 Dicotyledoneae 亚 纲:蔷薇亚纲(Rosidae) 目:桃金娘目Myrtiflorae 亚 科:千屈菜科Lythraceae 属:紫薇属Lagerstroemia 是否中国特有:是 是否引种栽培:非人工引种栽培 |
光紫薇（ 学名 Lagerstroemia glabra (Koehne) Koehne），为双子叶植物纲、千屈菜科、紫薇属的一种植物。产于中国广西贺县、湖北巴东。 [1]
光紫薇形态特征
乔木，高约10米；树皮薄，带白色；小枝无毛。叶膜质，椭圆状披针形或卵状椭圆形，长4.5-6.5厘米，宽2.2-3厘米，顶端短渐尖，基部短渐狭至近圆形，两面无毛，或沿中脉疏生小毛，侧脉5-6(-7)对；叶柄长2-5毫米。
圆锥花序顶生，塔形，长5-12厘米，宽2-8厘米，无毛或上部有小柔毛，总轴和分枝4棱形，棱角略尖；花萼钟形，长和宽约3毫米；花瓣矩圆形或椭圆形，长宽各约3毫米，边缘波状，爪长2-3毫米；雄蕊多数，3-6枚较长，其余的等长；子房近球形，无毛，花柱长而纤细。
蒴果小，黄色，矩圆形，长约8毫米，直径约5毫米，宿存萼筒长约4毫米，裂片5，三角形，长约2毫米，基部宽约2毫米；果梗纤细，长约4-5毫米；种子矩圆形，扁，长约6毫米，宽约2毫米。花期7月，果期10月。
Lagerstroemia glabra (Koehne) Koehne in Engl., Bot. Jahrb. 41: 102. 1907; Furtado et Montien in Gard. Bull. Sing. 24: 276. f. 33. 19fi9. p. p.——L. subcostata Koehne var. glabra Koehne in Engl., Bot. Jahrb. 4: 20. 1883 et in Engl., Pflanzenr. 17 (IV-216): 260. 1903; Rehd. et Wils. in Journ. Arn. Arb. 8: l79. 1927. p. p.
Lagerstroemia subcostata Koehne var. glabra Koehne, Bot. Jahrb. Syst. 4: 20. 1883; L. stenopetala Chun.
Trees, small, 7-10 m tall. Branchlets 4-angled, glabrous. Petiole 2-5 mm; leaf blade ovate-elliptic or elliptic-lanceolate, 4.5-6.5(-11.5) × 2.2-3(-4) cm, papery, glabrous, lateral veins 5-7 pairs, base cuneate to subrounded, apex shortly to long acuminate. Panicles pyramidal, 5-12 cm. Floral tube (4 or)5 or 6-merous, 4-5 mm, smooth walled, with 12 dark veins or obscurely 12-ribbed; sepals 1.5-2 mm, adaxially glabrous; annulus present, thin, scarcely developed; epicalyx absent. Petals white, oblong-lanceolate to elliptic, 6-7 mm including claw 1.5-3 mm. Stamens ca. 20, dimorphic. Ovary glabrous. Capsules ellipsoidal, 6-8 × 4-5 mm. Seeds including wing ca. 6 mm. Fl. Jul, fr. Oct.
● Guangdong, Guangxi, Hubei.
No consistent and taxonomically useful differences were found between Lagerstroemia stenopetala and L. glabra, although the lectotype of L. stenopetala was studied. The longer acuminate-caudate tip of the leaves of L. stenopetala seems to be the primary difference between the entities, and this condition can be found in some leaves of L. glabra. Given the variability of leaf shape generally found in Lagerstroemia, it is questionable whether this is significant at the species level. Petals of L. glabra and L. stenopetala are also similar and unusual for the genus, being lanceolate and not wrinkled in the proximal half. Furtado and Montien (Gard. Bull. Singapore 24: 185-334. 1969) also treated L. stenopetala as a synonym of L. glabra.