光紫薇
| 光紫薇 |
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拉丁學名:Lagerstroemia glabra (Koehne) Koehne 界:植物界 門:被子植物門 Angiospermae 綱:雙子葉植物綱 Dicotyledoneae 亞 綱:薔薇亞綱(Rosidae) 目:桃金娘目Myrtiflorae 亞 科:千屈菜科Lythraceae 屬:紫薇屬Lagerstroemia 是否中國特有:是 是否引種栽培:非人工引種栽培 |
光紫薇（ 學名 Lagerstroemia glabra (Koehne) Koehne），為雙子葉植物綱、千屈菜科、紫薇屬的一種植物。產於中國廣西賀縣、湖北巴東。 [1]
目錄
光紫薇形態特徵
喬木，高約10米；樹皮薄，帶白色；小枝無毛。葉膜質，橢圓狀披針形或卵狀橢圓形，長4.5-6.5厘米，寬2.2-3厘米，頂端短漸尖，基部短漸狹至近圓形，兩面無毛，或沿中脈疏生小毛，側脈5-6(-7)對；葉柄長2-5毫米。
圓錐花序頂生，塔形，長5-12厘米，寬2-8厘米，無毛或上部有小柔毛，總軸和分枝4棱形，稜角略尖；花萼鐘形，長和寬約3毫米；花瓣矩圓形或橢圓形，長寬各約3毫米，邊緣波狀，爪長2-3毫米；雄蕊多數，3-6枚較長，其餘的等長；子房近球形，無毛，花柱長而纖細。
蒴果小，黃色，矩圓形，長約8毫米，直徑約5毫米，宿存萼筒長約4毫米，裂片5，三角形，長約2毫米，基部寬約2毫米；果梗纖細，長約4-5毫米；種子矩圓形，扁，長約6毫米，寬約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.