Lagerstroemia stenophylla
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Ordo: Myrtales
Familia: Lythraceae
Genus: Lagerstroemia
Name
Lagerstroemia stenophylla B.H.Wu, X.Hu & S.P.Dai sp. nov. – Wikispecies link – Pensoft Profile
Type
China. Shannxi: Shangluo, Jinsixia Town, Xinglong Country, in ravine, on rocky slopes. 33°26'36.14"N, 110°32'51.13"E, 387 m a.s.l., 6 June 2023 (fl.), B.H. Wu & W.H. Tu Lg202334 (Holotype: IBSC!; isotypes: Herbarium of Guangzhou Institute of Forestry and Landscape Architecture!).
Diagnosis
Lagerstroemia stenophylla is morphologically similar to L. subcostata Koehne, but distinguished by its branchlets 4-angular, sometimes subalate, leaves elliptic-lanceolate, narrowly elliptic, leaf apex acute, leaf base cuneate, flowers 2.5–3 cm in diameter.
Description
Shrubs or small trees ca. 0.5–3 m tall. Bark reddish brown, longitudinally fissured and slightly peeling to reveal the inner bark when mature; branchlets scabridulous to glabrous, 4-angular, sometimes subalate. Leaves mostly alternate, or subopposite; petiole 1–3 (4) mm long, densely scabridulous to glabrous; leaf blade herbaceous, margin entire, lanceolate to elliptic-lanceolate, rarely ovate or obovate-oblanceolate, 2–6 (7) × 0.7–2 (2.3) cm, base cuneate, apex acute, sometimes obtuse, rarely apiculate, abaxially pale green, scabridulous (especially along midrib and later veins) to glabrous, adaxially green, sparsely scabridulous to glabrous, lateral veins 4–7 pairs. Inflorescences paniculate, terminal or axillary; panicles (2) 4–7 cm long, densely scabridulous. Flowers sessile or subsessile; flower buds turbinate to subglobose (excluding pseudopedicels). Calyx tubes (excluding pseudopedicels) cup-shaped, 3.3–4.2 mm long, outside densely scabridulous to glabrous, with 10–12 distinctly ribs or dark veins (sometimes not obvious), inside glabrous, with glabrous annulus (sometimes absent) in the throat, lobes 6, sometimes 5, triangular, 1–2.3 mm × 1–2.3 mm, erect, epicalyx absent, pseudopedicel 2–9 mm long; petals 6, crumpled, oblong, suborbicular or ovate, base cuneate to broadly cuneate, rounded, or sometimes subcordate, apex obtuse or rounded, 10–18 mm with claws 3–8 mm long; stamens 20–28, dimorphic, with 6 stamens longer (ca. 15 mm long), thicker and red-brown in color, the remaining stamens are shorter (ca.7 mm long), thinner and white in color, filaments glabrous; ovary glabrous, styles 10–14 mm long, glabrous, stigmas small. Capsules globose to oblong, 6–8 mm long, 4.5–6 mm in diameter, loculicidally dehiscent, 4–7-valved. Seeds ca. 6mm long including wing.
Phenology
Flowering from May to June, and fruiting after July and fruits persist through winter.
Distribution and habitat
Lagerstroemia stenophylla is hitherto known from Baihe County, Danfeng County, Shanyang County, Shangnan County, Xunyang County, Zhashui County, Zhen’an County of south-eastern Shaanxi Province and Baokang County, Fang County and Shiyan City of north-western Hubei Province (Fig. 2). It grows on rocky slopes in ravine, at 290–770 m elevation.
Etymology
The epithet of the new species refers to its narrow leaf blade.
Vernacular name
The Chinese name of the new species is here given as 狭叶紫薇 (xiá yè zǐ wēi).
Note
Lagerstroemia stenophylla is formerly misidentified as L. subcostata (Li and Li 2013[1]). Morphologically, L. stenophylla and L. subcostata share many similar characters, including calyx tubes cup-shaped, with ca. 12 ribs or darkened veins, epicalyx absent, and sepals adaxially glabrous, stamens less than 30, leading to misidentify L. stenophylla as L. subcostata, using the Keys of “Flora Reipublicae Popularis Sinicae” (Lee and Lau 1983[2]) and “Flora of China” (Qin and Graham 2007[3]). However, L. stenophylla is a shrub or small tree with conspicuously smaller, narrower leaves and larger flowers, differing distinctly from L. subcostata. Detailed morphological comparisons among L. stenophylla and its relatives are presented in Table 1.
| Characters | L. stenophylla | L. subcostata | L. indica | L. excelsa |
|---|---|---|---|---|
| Branchlets | 4-angular, sometimes subalate | terete to slightly 4-angular | 4-angled or subalate | terete |
| Leaf shape | elliptic-lanceolate, narrowly elliptic, rarely ovate, obovate-oblanceolate | oblong, ovate-lanceolate, elliptic, obovate-elliptic, or infrequently obovate | elliptic, oblong, obovate, or suborbicular | elliptic to broadly elliptic |
| Leaf size | 2–6 (7) × 0.7–2 (2.3) cm | 2–9 (11) × 1–5 cm | 2.5–7(10) × 1.5–4 cm | 7–13 × 3.5–5 cm |
| Leaf apex | acute, sometimes obtuse, rarely apiculate | acuminate | acute, obtuse with small mucro, or retuse | narrowly to broadly acuminate |
| Leaf base | cuneate | broadly cuneate to subrounded | broadly cuneate to rounded | acute |
| Lateral veins | 4–7 pairs | 3–10 pairs | 3–7 pairs | 7–9 pairs |
| Flower | 2.5–3 cm in diameter | less than 1 cm in diameter | 3–4 cm in diameter | ca. 0.5 cm in diameter |
| Calyx-tube | cup-shaped, with 10–12 distinctly ribs or dark veins, sometimes not obvious | cup-shaped, with 10–12 dark veins or faint ribs | campanulate, obscurely to decidedly 6-ribbed | tubular, with 12 dark veins or ribs |
| Annulus | present, sometime absent | thin or apparently absent | present | absent |
| Petal | 10–18 mm long including claw | 2–6 mm long including claw | 12–20 mm long including claw | 3–3.5 mm long including claw |
| Stamens | 20–28 | 15–30 | 36–42 | (5)6–12 |
| Seed | ca. 6 mm long including wing | ca. 4 mm long including wing | ca. 8 mm long including wing | 3.5–4.8 mm long including wing |
| Phenology | flowering from May to June, fruiting after July | flowering from June to August, fruiting from July to October | flowering from June to September, fruiting from September to November | flowering in April, fruiting in July |
Additional specimen examined
China. Shaanxi Province: Baihe County, Maoping, 29 September 1969, Vegetation Team 541 (WUK); ibid., 8 June 2023, B.H. Wu and W.H. Tu Lg202378, Lg202379, Lg202380, Lg202381; Danfeng County, Tumen Town, 6 June 2023, B.H. Wu and W.H. Tu Lg202329, Lg202331; Danfeng County, Zhulinguan Town, Baijiawan, 6 June 2023, B.H. Wu and W.H. Tu Lg202332; Shanyang County, Zhaochuan, 1 July 1960, Huashan Team 0206 (IBSC); Shanyang County, Manchuanguan, 17 September 1952, Z.B. Wang 16543 (KUN, PE, WUK); ibid., 1 May 1964, J.X. Yang 2456 (WUK); ibid., 19 May 2011, S.F. Li et al. 15016 (XBGH); ibid., 5 June 2023, B.H. Wu and W.H. Tu Lg202312, Lg202313, Lg202314, Lg202315, Lg202316, Lg202317, Lg202318, Lg202319; Shangnan County, Jinsixia, 6 June 2023, B.H. Wu and W.H. Tu Lg202335, Lg202336, Lg202337, Lg202338; Xunyang County, on the road from Zhaojiawan to Liangheguan, 7 October 1952, B.Z. Guo 2225 (WUK); Xunyang County, precise locality unknown, 1959, Xida 019 (WUK); Xunyang County, on the road from Zhangping to Xunyang, 19 August 1959, P.Y. Li 8962 (WUK); Xunyang County, Guojiacao, 7 May 2012, S.F. Li et al. 16523 (XBGH); Xunyang County, Liangheguan, 9 June 2023, B.H. Wu and W.H. Tu Lg202384, Lg202385, Lg202386, Lg202387, Lg202388; Zhashui County, Shiweng, 8 June 2008, S.F. Li et al. 10463; Zhen’an County, Lengshuihe, 9 June 2023, B.H. Wu and W.H. Tu Lg202389, Lg202390, Lg202392, Lg202393. Hubei Province: Baokang County, Siping, 21 April 1986, 84Linxue 86-1058 (CCAU); ibid., 8 June 2023, B.H. Wu and W.H. Tu Lg202365, Lg202366, Lg202367, Lg202369, Lg202372; Fang County, Wanyuhe, 8 June 2023, B.H. Wu and W.H. Tu Lg202373, Lg202374, Lg202375; Shiyan City, Wudangshan, 7 June 2023, B.H. Wu and W.H. Tu Lg202343, Lg202344, Lg202345, Lg202346, Lg202347, Lg202348.
Original Description
- Wu, B; Hu, X; Tu, W; Wang, W; Dai, S; 2023: Lagerstroemia stenophylla (Lythraceae), a new species from China PhytoKeys, 234: 127-133. doi
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Other References
- ↑ Li S, Li B (2013) Flora Tsinlingensis (Supplementum) Spermatophyte.Science Press, Beijing, 419 pp.
- ↑ Lee S, Lau L (1983) Lythraceae. In: Fang W Chang C (Eds) Flora Reipublicae Popularis Sinicae (Vol.52). Science Press, Beijing, 67–111.
- ↑ Qin H, Graham S (2007) Lagerstroemia. In: Wu C Raven P (Eds) Flora of China, 13.Science Press & Missouri Botanical Garden Press, Beijing & St. Louis, 277–281.
