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Polyalthia 001-003 THAI FOREST BULLETIN (BOTANY) NO. 34 ISSN 0495-3843 THE FOREST HERBARIUM NATIONAL PARK, WILDLIFE AND PLANT CONSERVATION DEPARTMENT BANGKOK, THAILAND DECEMBER 2006 THAI FOREST BULLETIN (BOTANY) Published by The Forest Herbarium (BKF) National Park, Wildlife and Plant Conservation Department Chatuchak, Bangkok 10900, Thailand Advisors Chamlong Phengklai, Leena Phuphathanaphong and Chawalit Niyomdham Editor Thawatchai Santisuk Editorial Board Kongkanda Chayamarit (BKF), David A. Simpson (K), John A. N. Parnell (TCD) David J. Middleton (E) and Paul Wilkin (K) Thai Forest Bulletin (Botany) (TFB) publishes papers on plant taxonomy (especially of vascular plants), nomenclature, phylogeny, systematics, plant geography, and floristics, and in morphology, palynology, cytotaxonomy, chemotaxonomy, anatomy and other relevant disciplines. Priority is given to papers written by staff of the Forest Herbarium and by botanists working on the Flora of Thailand Project. Limited space is available for other relevant papers. TFB is published once a year, usually in September. All manuscripts are peer reviewed. Manuscripts are considered on the understanding that their contents have not appeared, or will not appear, elsewhere in the same or abbreviated form. Before submitting a manuscript please read the Guidelines for authors at http://www.dnp.go.th/botany/ botany_eng/bulletin.html. These guidelines must be followed precisely otherwise publication of the manuscript will be delayed. Exchange with botanical journals or periodicals pertaining to plant taxonomy would be appreciated. THE FOREST HERBARIUM Director: Kongkanda Chayamarit Curator: Rachun Pooma BKF Staff: Thawatchai Wongprasert, Chana Phromdej, Thawat Ting-Nga, Thirawat Boonthavikoon, Metinee Tarumatsawat, Phongsak Phonsena, Wichai Onnom, Somran Suddee, Phornphitak Panyarat, Voradol Chamchumroon, Thanongsak Jonganurak, Piyachart Trisarasri, Thianchai Chanplaeng, Pachok Puudjaa, Phien Thuengkhun, Chakapan Thaweewan, Boonyuen Chuenchomklin, Tharathorn Kaeophlap, Paphot Kan-U-Rai. Coordinator: Nannapat Pattharahirantricin Front Cover: Thepparatia thailandica Phuph. (Photographed by R. Pooma) THAI FOR. BULL. (BOT.) 34: 1–3. 2006. Notes on Polyalthia (Annonaceae) PASAKORN BUNCHALEE* & PRANOM CHANTARANOTHAI** ABSTRACT. Polyalthia corticosa (Pierre) Finet & Gagnep., newly recorded from Thailand, is described. Two lectotypes are selected here. During the preparation of a revision of the genus Polyalthia for the Flora of Thailand we came across specimens from the North of Thailand which were not assignable to any species known to occur in the country. After careful examination, we found that these specimens belonged to P. corticosa (Pierre) Finet & Gagnep. which, therefore, is newly recorded for Thailand. Two species were found to be in need of lectotypification and that is undertaken herein. Polyalthia corticosa (Pierre) Finet & Gagnep. in Bull. Soc. Bot. Fr. 53 96. 1907 & in H. Lecomte, Fl. Indo-Chine. 1: 75. 1907; Ast, Suppl. Fl. Indo-Chine. 1: 79. 1938; Ban, Fl. Vietn. 1: 104. 2000. Type: Vietnam, Bien Hoa, Song Be, Pierre 1752 (lectotype P; isolectotypes A, K!). Fig. 1. Tree 10–20 m high. Young twigs rusty-brown pubescent, glabrescent, with numerous lenticels. Leaves chartaceous, narrowly elliptic to elliptic-lanceolate, 8–22 by 2–5.5 cm, apex acute, base cuneate or rounded, margin entire; glabrous on both surfaces except on the midrib and secondary veins below, midrib and secondary veins slightly prominent above, prominent below, secondary veins in 12–14 pairs, interarching 15–30 mm; tertiary veins reticulate; petioles 1–2 mm long (i.e. leaves subsessile). Flowers 1–2(–3) from the axils of fallen leaves; peduncles 1–1.5 cm long, pubescent, with small bract at base, ovate, 2–2.5 by 1–1.5 mm. Sepals chartaceous, ovate, 4–5 by 3–4 mm, apex acute, slightly puberulous outside, glabrous inside. Petals thinly coriaceous, yellowish, outer petal slightly shorter and narrower than the inner one, weakly pubescent outside, glabrous inside; outer petal ovate, 6–8 by 3–4 mm, apex acute, inner petal elliptic, 6–8 by 3–4 mm, apex acute. Torus cushion-shaped, 0.8–1 mm. thick, glabrous. Stamens cuneate, 0.8–1.2 mm; anthers 1–1.3 mm long; connective truncate, hiding the anther cell. Carpels numerous, elliptic, 0.8–1.1 mm long, pubescent; style subsessile; stigma ± rounded, above connective, pubescent; ovules 2 per carpel, placentation marginal. Fruit a cluster of separate, stipitate, dehiscent monocarps, the stipe 1–1.4 cm long, the monocarp oblong, 1–1.6 by 1.2–1.4 cm, glabrous; fruit stalks 1.5–2.5 cm long. * Department of Biology, Faculty of Science, Mahasarakham University, Kantarawichai District, Mahasarakham 44150, Thailand. ** Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen, Khon Kaen 40002, Thailand. 2 THAI FOREST BULLETIN (BOTANY) 34 Thailand.— NORTHERN: Phrae (Huai Hom, Ban Nam Krai, Huai Yuak), Uttaradit. Distribution.— Laos, Vietnam. Ecology.—Along streams in dry evergreen forest, 500–800 m. Flowering Feb.–May, fruiting March–July. Vernacular.— Sa ban nga pa ( ∫—πß“ªÉ“). Specimens examined.— A. Chanthamuk 43 (BKF); C. Phengklai 50 (BKF); T. Smitinand & A. Cheke 10805 (BKF). Notes.— Polyalthia corticosa differs from P. evecta (Pierre) Phamh. (characters in brackets) in being a medium-sized (shrubby tree) tree, with rough (smooth) twigs, with the outer and inner petals more or less the same size (inner petals larger) and with two (one) ovules per carpel The Thai specimens extend the range of P. corticosa from Vietnam and Laos westward to northern Thailand. A B Figure 1. Polyalthia corticosa (Pierre) Finet & Gagnep. Photo from T. Smitinand & A. Cheke 10805 (BKF). A. habit; B. flower. NOTES ON POLYALTHIA (ANNONACEAE) (P. BUNCHALEE & P. CHANTARANOTHAI) 3 Polyalthia angustissima Ridl., J. Straits Branch Roy. Asiat. Soc.. 54: 11. 1910. Type: Singapore, Bukit Timah, Ridley 8050 (lectotype SING!; isolectotype K!, selected here). The original description mentioned unnumbered collections of Ridley and Lake & Kesall. The former was collected by Ridley at the Garden Jungle, Bukit Timah, Singapore. The latter was collected by Lake & Kesall from Kwala Sembrong, Johore. We have examined these specimens and found that they are Ridley 8050 (SING!, K!) and Lake & Kesall 4047 (SING!). The Ridley material is well preserved with duplicates in two institutes. Therefore, we have chosen the specimen at SING as the lectotype and the one at K as the isolectotype. Polyalthia dumosa King in Mat. Fl. Malay Penins. 1: 52. 1892. Type: Malaysia, Perak, Maxwell’s Hill, Wray 2628 (lectotype SING!; isolectotype CAL!). In the protologue, King mentioned unnumbered and unknown locality collections of Wray and Scortechini. When Sinclair (1955) revised the Annonaceae for the Malay Peninsula, he cited three syntypes, Wray 2628 (CAL, SING) and 2978 (SING, K) and Scortechini 601 (CAL, SING). Wray 2628 was collected from “Maxwell’s hill, Perak” in September 1888. The specimen deposited at SING is the best preserved specimen. Hence, it is chosen as the lectotype and specimen at CAL as the isolectotype. ACKNOWLEDGEMENTS We are grateful to Drs D.A. Simpson and R. Johns for help at K. We would like also to thank the curators and staff of BK, BKF, BM, K and SING for access to their collections and information necessary for this study. The first author was assisted by grants from the Faculty of Science, Maha Sarakharm University and the TRF/BIOTEC Special Program for Biodiversity Research and Training Program (BRT-541090), which enabled him to visit the Royal Botanic Gardens, Kew, the British Museum (Natural History) and The Linnean Society of London during 2002. REFERENCES Ban, N.T. (2000). Flora of Vietnam 1: 74–116. Science & Technics Publishing House, Hà Nôi. King, G. (1892). Polyalthia. In: Materials towards a Flora of the Malay Peninsula 1(4): 49–67. Lecomte, M.T. (1907–1908). Flore Gânerale de l’ Indo-Chine 1: 65–76. Masson et Cie, Editeurs, Paris. Ridley, H.N. (1922). Polyalthia. In: Flora of the Malay Peninsula 1: 49–61. L. Reeve & Co. Ashford, Great Britain. Sinclair, J. (1955). A Revision of the Malayan Annonaceae. Gardens Bulletin Singapore 14: 149–516. THAI FOR. BULL. (BOT.) 34: 4–24. 2006. A checklist of the genus Ixora L. (Rubiaceae) in Thailand VORADOL CHAMCHUMROON* ABSTRACT. A checklist of Ixora in Thailand is presented. The following 27 species are recognized. A key to the species, ecological data and geological distribution are provided. Ixora L. is a genus of trees and shrubs within the Rubiaceae. Ixora contains 563 species according to Govaerts et al. (2006), some of which are ornamental plants such as I. coccinea L. The highest numbers of species occur in southeast Asia and Malaysia reaching a maximum in Borneo (Bremkamp, 1937a) although the genus is pantropically distributed. The systematics of Ixora at generic level is quite well understood, but the delimitation of species is not. Thus there have been both confusion and superfluity in nomenclature. The most recent accounts of the genus are those of Bremekamp (1937b) and Corner (1941), the latter dealing with Malayan taxa. Thus there is no modern guidance to identification for Ixora species. The Rubiaceae is one of the largest families not yet treated for the Flora of Thailand, and Ixora represents one of the most problematic genera of the family, with the limits of many species needing to be clarified. In Thailand, Craib (1934) listed Ixora in the Florae Siamensis Enumeratio and enumerated about 38 species and seven varieties. Boonbundral (1978) carried out a preliminary study of the genus Ixora in Thailand with 23 species and 3 varieties. In peninsular Malaysia only 20 species of Ixora were recorded from the lowlands and mountains (Corner, 1941). MATERIALS & METHODS The Ixora treatment for the Flora of Thailand is based on the examination of 1,200 specimens from Thailand at the following herbaria: AAU, BK, BKF, C, K, PSU, QBG, W and WU. Abbreviations follow Holmgren & Holmgren (1990). Comparative morphology was used to delimit species in all cases. A list of the specimens of each species consulted indicating the herbaria in which they are kept is available from the author by email on request.
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