Survey of Lagerstroemia L. (Lythraceae) in Indochina (Excl
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Survey of Lagerstroemia L. (Lythraceae) in Indochina (excl. Thailand) with the description of Lagerstroemia densifl ora, sp. nov., a new species from Vietnam Willem J. J. O. DE WILDE Brigitta E. E. DUYFJES Naturalis Biodiversity Center, section Botany, P.O. Box 9517, 2300 RA Leiden (The Netherlands) [email protected] Published on 30 December 2016 De Wilde W. J. J. O. & Duyfjes B. E. E. 2016. — Survey of Lagerstroemia L. (Lythraceae) in Indochina (excl. Thailand) with the description of Lagerstroemia densifl ora, sp. nov., a new species from Vietnam. Adansonia, sér. 3, 38 (2): 241-255. https://doi.org/10.5252/a2016n2a8 ABSTRACT Lagerstroemia L. (Lythraceae) in Indochina (Cambodia, Laos, and Vietnam) comprises 21 species. Six species, namely Lagerstroemia densifl ora W.J.de Wilde & Duyfj es, sp. nov., L. gagnepainii Furtado & KEY WORDS Srisuko, L. kratiensis W.J.de Wilde & Duyfj es, L. micrantha Merr., L. lecomtei Gagnep., L. petiolaris Lythraceae, Pierre ex Laness., only occur in Indochine. Lagerstroemia densifl ora W.J.de Wilde & Duyfj es, sp. nov., Lagerstroemia, Indochina, from Vietnam, is new to science; it diff ers from the most similar Lagerstroemia duperreana Pierre Cambodia, ex Gagnep. by a compact and densely fl owered infl orescence, the calyx tube smooth and unridged, Laos, the pseudopedicel at anthesis 3-4 mm long, in fruit 4-5 mm long, and the glabrous capsules with a Vietnam, lectotypification, smooth surface. For each species the original reference, typifi cation, spot- characters and distribu- new species. tion are presented. Th ere are two keys to the species, one for fl owering and one for fruiting material. RÉSUMÉ Étude de Lagerstroemia L. (Lythraceae) en Indochine (à l’exception de la Th aïlande) et description d’une nouvelle espèce du Vietnam, Lagerstroemia densifl ora, sp. nov. Dans cette mise au point, 21 espèces du genre Lagerstroemia L. (Lythraceae) sont reconnues en Indo- chine (Cambodge, Laos et Vietnam). Six espèces, à savoir Lagerstroemia densifl ora W.J.de Wilde & Duyfj es, sp. nov., L. gagnepainii Furtado & Srisuko, L. kratiensis W.J.de Wilde & Duyfj es, L. micrantha MOTS CLÉS Merr., L. lecomtei Gagnep. et L. petiolaris Pierre ex Laness. sont endémiques d’Indochine. Lagerstroe- Lythraceae, mia densifl ora W.J.de Wilde & Duyfj es, sp. nov., de Vietnam, est nouvelle pour la science, celle-ci Lagerstroemia, Indochina, ressemble à L. duperreana Pierre ex Gagnep., mais en diff ère par son infl orescence compacte et mul- Cambodge, tifl ore, son tube calicinal lisse et non côtelé, son pseudopédicelle de 3-4 mm de long à l’anthèse, et de Laos, 4-5 mm de long en fruit, sa capsule à surface lisse et glabre. Pour chaque espèce sont mentionnés les Vietnam, lectotypification, références bibliographiques, ainsi que la typifi cation, quelques caractères typiques, et la distribution. espèce nouvelle. Deux clés sont présentées, l’une pour les spécimens en fl eurs et l’autre pour les spécimens en fruits. ADANSONIA, sér. 3 • 2016 • 38 (2) © Publications scientifi ques du Muséum national d’Histoire naturelle, Paris. www.adansonia.com 241 De Wilde W. J. J. O. & Duyfj es B. E. E. INTRODUCTION With the new species Lagerstroemia densifl ora, sp. nov., the number of Lagerstroemia species in Cambodia, In connection with the study of Lagerstroemia L. for Flora of Laos and Vietnam now is 21. In the account for Indo- Th ailand, also those taxa of Indochina were taken into account. china by Gagnepain (1921) it was 27, in the revision By going through the material in the Paris herbarium one by Furtado & Srisuko (1969) it was 23. For Th ailand unidentifi ed collection from Vietnam appeared to represent De Wilde et al. (2014) accepted 18 species. an undescribed species. In the enumeration, for each species the relevant literature, Based on the genus account by Furtado & Srisuko (1969) typifi cation, a brief compilation of characters for compari- and the revision of Lagerstroemia for the Flora of Th ailand son (under the heading ‘Spot-characters’), distribution, and (De Wilde et al. 2014) it appeared that the fl ora treatment by miscellaneous notes are presented. For species descriptions Gagnepain (1921) for Indochina needed some revision as ex- we refer to Gagnepain (1921), Furtado & Srisuko (1969), pressed in the keys and enumeration of species presented below. De Wilde & Duyfj es (2013), and De Wilde et al. (2014). KEY TO FLOWERING SPECIMENS OF LAGERSTROEMIA L. IN INDOCHINA (Petals measured in the dry state; the pseudopedicel is the narrowed shorter or longer stipe of the base of the calyx tube) 1. Ovary glabrous ............................................................................................................................................ 2 — Ovary hairy ............................................................................................................................................... 12 2. Flowers small, the bud 1.5-2 mm diam. ..................................................................... 13. L. micrantha Merr. — Flowers larger, the bud 5 mm diam. or more ............................................................................................... 3 3. Flower bud (excluding pseudopedicel) globose ............................................................................................ 4 — Flower bud obovoid .................................................................................................................................... 7 4. Flower bud smooth, un-ridged, glabrous, 5-7 mm diam. Petals with claw c. 10 mm long, claw about as long as blade (cultivated) ...................................................................................................................... 8. L. indica L. — Flower bud ridged, short-hairy or glabrous, 5-15 mm diam. Claw of petals much shorter than the blade .......... 5 5. Flower bud c. 5 mm diam., thinly hairy; petals c. 15 mm long ............... 7. L. gagnepainii Furtado & Srisuko — Flower bud 8-15 mm diam., hairy or glabrous; petals 20 mm long or more ................................................ 6 6. Flower bud glabrous, 12-15 mm diam. ...................................................................... 12. L. macrocarpa Kurz — Flower bud thinly hairy, 8-11 mm diam. .....................................................................17. L. speciosa (L.) Pers. 7. Flower bud (calyx tube) not ridged. Infl orescence compact ....... 4. L. densifl ora W.J.de Wilde & Duyfj es, sp. nov. — Flower bud (calyx tube) ridged, sometimes faintly ridged only. Infl orescence compact or lax ....................... 8 8. Ridges (faint) 12, twice the number of calyx lobes .................................... 5. L. duperreana Pierre ex Gagnep. — Ridges 5-9, all alternating with as many calyx lobes ..................................................................................... 9 9. Flowers large, petals 20 mm long or more. Calyx lobes (6-)7-9 .................... 15. L. ovalifolia Teijsm. & Binn. — Flowers smaller, petals less than 10 mm long. Calyx lobes (5 or) 6 ............................................................ 10 10. Calyx with large ear-like auricles, at anthesis resembling calyx lobes, alternating with the calyx lobes .............. ................................................................................................................. 20. L. venusta Wall. ex C.B.Clarke — Calyx without large auricles ....................................................................................................................... 11 11. Infl orescences compact, short, 3-8 cm long. Leaves beneath with simple hairs all over ............................... ....................................................................................................................... 21. L. villosa Wall. ex Kurz — Infl orescences lax, 8-25 cm long. Leaves glabrescent or with minute hairs along the midrib beneath .............. ............................................................................................................................ 3. L. crispa Pierre ex Laness. 12. Calyx lobes glabrous within ....................................................................................................................... 13 — Calyx lobes (in upper part) hairy within .................................................................................................... 15 13. Petiole 1-2 cm long. Petals including claw c. 30 mm long ............................ 16. L. petiolaris Pierre ex Laness. — Petiole less than 1 cm long. Petals including claw less than 30 mm long .................................................... 14 14. Lower surface of leaves hairy; venation scalariform. Calyx tube with low ridges ......... 19. L. tomensosa C.Presl — Lower surface of leaves glabrous; venation reticulate. Calyx tube with conspicuous winged ridges .................. .......................................................................................................... 9. L. kratiensis W.J.de Wilde & Duyfj es 15. Calyx tube not or obscurely ridged ............................................................................................................ 16 — Calyx tube with prominent ridges or wings ............................................................................................... 19 242 ADANSONIA, sér. 3 • 2016 • 38 (2) Survey of Lagerstroemia L. (Lythraceae) in Indochina and description of a new species 16. Infl orescences mostly lateral. Margin of petals fi mbriate. Leaf venation scalariform (introduced) .................... .....................................................................................................................