Globba macrochila 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 : 29-32

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

urn:lsid:ipni.org:names:77195005-1

Figs 2F , 6 , 13–14

Diagnosis

Similar to G. flagellaris in its bright orange flowers, but differing by its much longer labellum, 19– 20 mm long (vs short labellum, 10–12 mm long) and growing in dry areas (vs moist areas).

Etymology

Greek, ‘ macros ’ (large) and ‘- chila ’ (-lipped), referring to its long labellum.

Type material

Holotype

THAILAND • Kanchanaburi, Sai Yok ; 30 Jul. 1928; Put 1779 leg.; BK.

Isotypes

THAILAND • Same data as for the holotype; C, K, P.

Other material examined

MAYNMAR – Mawlamyine • Kyauk Ta Lon Pagoda, 13½ miles from Moulmein on Ye road; 21 Jul. 1958; H.S. McKee 6319 leg.; K.

THAILAND – Kanchanaburi • Erawan National Park; 1 Jul. 1974; K. Larsen and S.S. Larsen 33956 leg.; AAU, BKF, K, P; Erawan National Park ; 11 Jul. 1978; C. Phengklai, M. Tamura, C. Niyomdham and B. Sangkhachand 4286 leg.; BKF • Kin Sayok [Sai Yok?], ca 120 km NW of Kanchanaburi; 10 Jul. 1946; A.J.G.H. Kostermans 1050 leg.; A, P , US • Khao Tha Takua , “Ta Taklua”; 25 Jun. 1925; Put 20 leg.; BK, C, K • Sai Yok ; 30 Jul. 1928; A. Marcan 2341 leg.; K • Sai Yok ; 1 Jul. 1963; K. Larsen 10410 leg.; AAU, BKF • Sai Yok, Thung Kang Yang ; 5 Jul. 1963; K. Larsen 10525 leg.; AAU • Thong Pha Phum, Ban Prang Kasi ; 19 Jun. 1946; G.D. Hoed and A.J.G.H. Kostermans 665 leg.; A, K, P • Thong Pha Phum ; 4 Jul. 1973; J.F. Maxwell 73–108 leg.; AAU. – Lamphun • Li, Mae Ping National Park, Ko Luang Waterfall ; 9 Sep. 2009; D.J. Middleton and P. Triboun 4818 leg.; E, QBG. – Non wild collected material • Kanchanaburi, Sai Yok ; 24 Jun. 2014; Queen Sirikit Botanic Garden acc. no. 20161700A, vouchered as ‘ S. Sangvirotjanapat 795’; QBG .

Description

Herb, 25–60 cm tall, clump-forming, growing in rather dry areas, leaning, with upright inflorescence. Leaf sheaths 3–5, bladeless; ligule 2–5 mm long, bilobed or truncate, pubescent or glabrous, light green with white margin; blades 5–10, 5–15.5 × 1.3–2.5 cm, elliptic to ovate, base obliquely obtuse, apex acuminate, strigose along veins above, otherwise glabrous; petiole, if present, to 1 cm. Inflorescence 5–11 × 5–12 cm, lax, conical; peduncle 1–2 cm long; rachis glabrous; bracts caducous, bracteoles 2–10 mm long, persistent, elliptic, apex and margin pubescent; cincinni 1–7 cm long; pedicel to 6 mm. Flowers 3.0– 3.6 cm long, ovary and calyx green, the rest pure orange; ovary ca 4 mm long (⚥), ellipsoid, ridged; calyx 3–5 mm long, infundibuliform, lobes acuminate; floral tube 9–11 mm long, dorsal and lateral corolla lobes ca 6 × 3 mm, hooded, elliptic; lateral staminodes 12–14 × 7–8 mm, obovate, apex acute; labellum 19–20 × 4–7 mm, triangular, bilobed, spot absent, base truncate, apex obtuse, nectar tube ca 6 mm long; filament ca 30 mm; anther ca 1.5 mm long, connective tissue, crest and appendages orange, semi-translucent, crest ca 1 mm long (shorter in Ƌ), truncate; ⚥ 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 ellipsoid, longitudinally ridged, green. Bulbils produced at peduncle and cincinni, ellipsoid, tissue corky.

Distribution and habitat

Myanmar and Thailand, 100–350 m a.s.l., in rather dry forest.

Conservation status

Least Concern. Although this species has a small AOO of 32 km 2, the populations in Kanchanaburi province, where this species is commonest, are found in several protected areas. It is also grown in Queen Sirikit Botanic Garden.

Notes

Usually found in somewhat dry areas, such as bamboo forest. The labellum is remarkable, being longer than the lateral staminodes. It always covers the lateral corolla lobes. Plants were cultivated under more humid test conditions in Bangkok to find out the stability of the morphological characters. After growing for one season, the environmental factors affected only vegetative structures, i.e., leafy stem size, inflorescence size but did not influence the ratios of the floral parts.

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. 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.

Fig. 13. Globba macrochila Sangvir. & M.F.Newman sp. nov. A. Habit. B. Crowded cincinnus. C. Flower, front and side views. D. Dorsal corolla lobe. E. Lateral corolla lobes, front and side views (same scale with D). F. Lateral staminodes. G. Variation of labellum shape. Drawing: S. Sangvirotjanapat from S. Sangvirotjanapat 795 leg.

Fig. 14. Globba macrochila Sangvir. & M.F.Newman sp. nov. A. Habit. B. ç Flower (front view). C. ç flower (side view). D. Ƌ flower (front view). E. Ƌ flower (side view). Photographs: S. Sangvirotjanapat from S. Sangvirotjanapat 795 leg.