Globba aranyaniae Sangvir. & M.F.Newman

Sangvirotjanapat, Sunisa, Denduangboriphant, Jessada & Newman, Mark F., 2019, A taxonomic revision of Globba subsect. Nudae (Zingiberaceae), European Journal of Taxonomy 503, pp. 1-37 : 10-14

Globba aranyaniae Sangvir. & M.F.Newman sp. nov.

urn:lsid:ipni.org:names:77195003-1

Figs 2A , 4–6

Diagnosis

The main distinguishing character within G. subsect. Nudae is the red or brown spot on the labellum. Laotian and northern Thai populations resemble G. flagellaris and G. macrochila sp. nov. by their condensed cincinni, and orange-toned flowers with rather broad lateral staminodes (> 5 mm). Central and eastern Thai populations resemble G. expansa by their lax cincinni, orange-toned flowers, and ellipsoid fruits.

Etymology

The epithet ‘aranyaniae’ derives from ‘Aranyani’ who is a princess in the myth relating to the name of the type locality, Pha Nang Khoy (‘Cave of the Lady who Waits’).

Type material

Holotype THAILAND • Phrae, Rong Kwang, Tham Pha Nang Khoi ; 18°22′9″ N, 100°21′16″ E; 350 m a.s.l.; 15 Sep. 1999; P. Srisanga and C. Puff 1075 leg.; QBG.

Isotype

THAILAND • Same data as for the holotype; E00726636; E.

Other material examined

LAOS – Louangphabang • Along Mekong River ; 12 Jun. 2012; J. Leong-Škorničková, H.Ð. Tr ẫn, O. Šída, K. Phoutthavong and S. Oudomsack 1688 leg.; E . – Vientiane Capital • Ban Dong Mak Kay ; 27 Jun. 2012; J. Leong-Škorničková, H.Ð. Tr ẫn, S. Bouamanivong, P. Phothisath and S. Lonphongs 1827 leg.; E .

THAILAND – Chaiyaphum • Ban Nam Phrom ; 25 May 1974; R. Geesink, T.A. Hattink and C. Phengklai 6974 leg.; AAU, BKF, C, K, P . – Chiang Mai • Sankamphaeng, Doi Muang On, west side, Muang On subdistrict; 4 Sep. 1995; P. Palee 315 leg.; L • Sankamphaeng, Muang On Cave ; 29 Jul. 1989; J.F. Maxwell 89–956 leg.; A, L • Chom Thong, Mae Soi valley ; 9 Sep. 1990; J.F. Maxwell 90–974 leg.; L . – Kamphaeng Phet • Khlong Lan, Khlong Lan waterfall; 20 Sep. 2015; W. Tanming 883 leg.; QBG . – Lamphun • Doi Khun Taan National Park, Tah Goo station area; 29 Aug. 1994; J.F. Maxwell 94–926 leg.; A, BKF, L . – Nakhon Nayok • Nang Rong Waterfall ; 4 Aug. 1992; K. Larsen, S.S. Larsen, C. Niyomdham, P. Sirirugsa, D.D. Tirvengadum and C.T. Nørgaard 43775 leg.; AAU • Nang Rong Waterfall ; 13 Aug. 1968; K. Larsen, T. Santisuk and E. Warncke 3359 leg.; AAU, BKF • Phrae, Huai Rong [Doi Sawan] waterfall, NE of Phrae; 9 Sep. 1995; K. Larsen, S.S. Larsen, C. Tange and D. Sookchaloem 46260 leg.; AAU. – Non wild collected material • Phrae, Long, Doi Phaklong National Park ; 27 Jun. 2014; Queen Sirikit Botanic Garden acc. no. 20146414A, vouchered as, S. Sangvirotjanapat 785; QBG .

Description

Clump-forming herb, 40–80 cm tall, stems leaning with inflorescence turned upright. Leaf sheaths ca 3, bladeless; ligule 2–5 mm long, light green with white margin, bilobed, ciliate; blades 6–9, 7.5–16 × 2.5– 4.5 cm, elliptic, plicate, base obliquely obtuse, apex acuminate, strigose along veins above, otherwise glabrous. Inflorescence 7–15 × 5.5–13 cm, lax, conical; peduncle 2–5 cm long; rachis green, glabrous; bracts caducous; bracteoles 2–10 mm long, persistent, elliptic, glabrous but for a few strigillose hairs at apex, light green; cincinni 1–10 cm long, flowers condensed at tip or lax; pedicel to 5 mm. Flowers 3–3.8 cm long; ovary ellipsoid, ca 4 mm long, green (Ƌ), ridged; calyx ca 4 mm long, infundibuliform, lobes acuminate, ciliate, green; floral tube ca 13 mm long, yellow-orange, dorsal and lateral corolla lobes 5–7 × 3 mm, elliptic, hooded, orange-green; lateral staminodes 14–16 × 6–8 mm, obliquely obovate, yellow-orange, apex round; labellum 6–8 × 5–7 mm, triangular, bilobed, yellow-orange with red or brown spot at centre (flowers of pure colour, without a spot occur rarely in natural populations), base truncate, apex round, nectar tube ca 5 mm long; filament 26–28 mm long, yellow-orange; anther ca 1.5 mm long, connective tissue, crest, and appendages orange, semi-translucent, crest truncate, ca 1 mm long (shorter in Ƌ); ⚥ appendages ca 3 mm long, acuminate, bifid, upper pair bigger, decurrent to connective tissue and crest, lower pair smaller; Ƌ appendages ca 3 mm long, acuminate, bifid to halfway, upper pair only slightly bigger than lower. Fruit 17–18 × 4–6 mm, ellipsoid, longitudinally ridged. Bulbils produced at base of peduncle or tip of cincinni or protruding from leaf sheaths, obovate, tissue corky, producing one shoot.

Distribution and habitat

Laos and Thailand, at 100–700 m a.s.l., on limestone in mixed evergreen forest or near streams.

Conservation status

Least Concern. This species occurs in protected areas and suitable habitats across its range. In recent years, no major threat to this species has been reported so it is of Least Concern.

Notes

This species grows on limestone bedrock from the Louangphabang range to the Sankamphaeng range. It is the only species in G. subsect. Nudae with a spot on the labellum, which varies from red to brown. The vegetative parts of this species vary between the two main distribution areas. In Laotian and northern Thai populations, the inflorescences consist of condensed cincinni packed with bracteoles and pedicels at the tip of each cincinnus, and bulbils produced at the base of the peduncle, while, in central and eastern Thai populations, the cincinni are more elongate, and the bulbils are usually produced at the tip of the cincinni or protrude from the leaf sheaths. In eastern Thailand, the plants are found in more humid places so there may be an ecological difference between the populations but the floral morphology is very uniform, especially the diagnostic characters, namely the spot on the labellum and broad lateral staminodes.

Figures

Fig. 2. Globba subsect. Nudae K.Larsen. A. G. aranyaniae Sangvir. & M.F.Newman sp. nov. (S. Sangvirotjanapat 785 leg.). B. G. expansa Wall. ex Horan. (M.F. Newman 2561 leg.). C. G. flagellaris K.Larsen (M.F. Newman and JLS 2048 leg.). D. G. insectifera Ridl. (S. Sangvirotjanapat s.n. leg.). E. G. lithophila Sangvir. & M.F.Newman sp. nov. (M.F. Newman 2576 leg.). F. G. macrochila Sangvir. & M.F.Newman sp. nov. (S. Sangvirotjanapat 795 leg.). Photographs: S. Sangvirotjanapat.

Fig. 4. Globba aranyaniae Sangvir. & M.F.Newman sp. nov. A. Habit. B. Tip of cincinnus. C. ç flower. D. Dorsal corolla lobe. E. Lateral corolla lobes (same scale as D). F. Labellum. G. Lateral staminodes. H. ç appendages. I. Ƌ appendages (same scale as H). Drawing: S. Sangvirotjanapat from S. Sangvirotjanapat 785 leg.

Fig. 5. Globba aranyaniae Sangvir. & M.F.Newman sp. nov. A. Habit. B. ç flower. C. Ƌ flower (front view). D. Ƌ flower (side view). E. Fruit. Photographs: A, E, J.L. Škorničková from J.L. Škorničková 1688 leg.; B–D, S. Sangvirotjanapat from S. Sangvirotjanapat 785 leg.

Fig. 6. Distribution range of G. aranyaniae Sangvir. & M.F.Newman sp. nov. (circles), G. flagellaris K.Larsen (squares), G. lithophila Sangvir. & M.F.Newman sp. nov. (triangles), G. macrochila Sangvir. & M.F.Newman sp. nov. (stars). The type locality of each species is indicated by a bigger symbol.