No.4   M. Möller, K. NISHII, H.J. Atkins, H.H. Kong, M. KA Y.G. WEI, F. WEN, X. HONG & D.J. Middleton

An expansion of the genus Deinostigma (Gesneriaceae)

Gardens’ Bulletin Singapore 68(1): 145–172.

ABSTRACT

Based on molecular, morphological and cytological studies the previously monotypic genus Deinostigma W.T.Wang & Z.Y.Li has been expanded to include several species previously ascribed to Primulina Hance. Deinostigma now comprises seven species, including one previously placed in synonymy. The new combinations Deinostigma cicatricose (W.T.Wang) D.J.Middleton & Mich.Möller, Deinostigma cycnostyla (B.L.Burtt) D.J.Middleton & H.J.Atkins, Deinostigma cyrtocarpa (D.Fang & L.Zeng) Mich.Möller & H.J.Atkins, Deinostigma eberhardtii (Pellegr.) D.J.Middleton & H.J.Atkins, Deinostigma minutihamata (D.Wood) D.J.Middleton & H.J.Atkins and Deinostigma tamiana (B.L.Burtt) D.J.Middleton & H.J.Atkins are made. Deinostigma eberhardtii is lectotypifed. The genus is defined by a combination of an alternate leaf arrangement, hooked hairs on many plant parts, flowers with the pedicel inserted at an angle and off-centre on the receptacle, and, where known, a somatic chromosome number (2n) of < 36. This new circumscription of the genus expands its distribution from Vietnam into South China.

Fig. 1. Maximum parsimony strict consensus tree based on combined ITS and trnL-F sequence data. Clades representing entire genera are collapsed. Numbers along the branches are bootstrap values. Asterisks denote branches receiving < 50% support.

Fig. 2. Bayesian inference majority rule consensus tree based on combined ITS and trnL-F sequence data. Clades representing entire genera are collapsed. Numbers along the branches are posterior probability values. Asterisks denote branches with < 0.5 posterior probability.

Fig. 3. Photographic sections taken near the base, the middle and the tip of ovaries of diverse species belonging to Deinostigma W.T.Wang & Z.Y.Li (A–C), species previously included in Chirita Buch.-Ham. (D–F) and Microchirita prostrata J.M.Li & Z.Xia (G). (Photos: M. Möller)

Fig. 4. Chromosome spread preparations of three Deinostigma W.T.Wang & Z.Y.Li species. A. Deinostigma poilanei (Pellegr.) W.T.Wang & Z.Y.Li prometaphase with 2n=32 chromosomes. B. Deinostigma cicatricosa (W.T.Wang) D.J.Middleton & Mich.Möller prometaphase with 2n = 32 chromosomes. C. Deinostigma cyrtocarpa (D.Fang & L.Zeng) Mich.Möller & H.J.Atkins prometaphase with 2n = c. 30 chromosomes. Scale bar: 10µm. (Photos: A, C: M. Möller; B: Hui-Min Li)

Fig. 5. Deinostigma cicatricosa (W.T.Wang) D.J.Middleton & Mich.Möller (A–D) and D. cyrtocarpa (D.Fang & L.Zeng) Mich.Möller & H.J.Atkins (E–H). A. Habit and mature fruits. B. Flower cut open. C. Flower top view. D. Flower front view. E. Habit. F. Mature fruits. G. Flowering branch. H. Flowers front view. (Photos: A, B, E, F: M. Möller; C, D, G, H: Yi-Gang Wei)

Fig. 6. Deinostigma poilanei (Pellegr.) W.T.Wang & Z.Y.Li (A–E) and D. tamiana (B.L.Burtt) D.J.Middleton & H.J.Atkins (F–J). A. Habit. B. Flower side view. C. Flower front view. D. Immature fruit. E. Mature fruit. F. Habit. G. Flower side view. H. Flower front view. I. Immature fruit. J. Mature fruit. (Photos: A, B, C, F–J: M.Möller; D, E: Sadie Barber)