No.15  JIE HUANG, XIAO-GUO XIANG, YONG-BIN LU, BO PAN & QIANG ZHANG：

Hemiboea pterocaulis comb. & stat. nov. (Gesneriaceae), a new species segregated from H. subcapitata C. B. Clarke

Nordic Journal of Botany

ABSTRACT

Hemiboea subcapitata C. B. Clarke is a widespread and morphologically varied species including three varieties, H. subcapitata var. subcapitata C. B. Clarke, H. subcapitata C.B. Clarke var. guangdongensis (Z. Y. Li) Z. Y. Li and H. subcapitata C. B. Clarke var. pterocaulis Z. Y. Li. However, previous description and our recent extensive observations indicated that H. subcapitata var. pterocaulis can be readily distinguished from the rest of H. subcapitata (i.e. H. subcapitata var. subcapitata and H. subcapitata var. guangdongensis) by some distinct morphological characters and the nonoverlapping phenological periods. Further, the present phylogenetic analyses using the nuclear ITS and plastid trnL-F DNA sequences also revealed that the sampled individuals identified as H. subcapitata var. pterocaulis grouped together and were clearly separated from other H. subcapitata. Based on these observations, we elevate the variety to the status of species, Hemiboea pterocaulis (Z. Y. Li) J. Huang, X. G. Xiang & Q. Zhang, comb. & stat. nov.

Figure 1: Hemiboea pterocaulis. (A) habitat, (B) plant individual, (C) variation of stems with variable winged edges, (D) fruits, (E) involucre, (F) side view of flower, (G) front view of flower, (H) opened corolla with stamens and staminodes, (I) calyx with pistil, (J) pistil with disc, (K) opened calyx.

Figure 2: Hemiboea pterocaulis. (A) habit (plant individual), (B) opened corolla showing stamens and staminodes, (C) pistil with disc, (D) opened calyx, (E) involucres, (F) fruits. Illustrated by Wen-Hong Lin based on specimens collected from Chuanshan park, Guilin.

Figure 3: Hemiboea subcapitata. (A, B) plant individuals with different type of terminal paired leaves, (C) involucre, (D) inflorescence, (E) front view of flower, (F) side view of flower, (G) stem, (H) opened corolla with stamens and staminodes, (I) calyx with pistil, (J) pistil with disc, (K) calyx.

Figure 4: The majority rule consensus tree based on Bayesian inference analysis based on ITS sequences with PP values (> 0.50) and BSMP values (>50%) shown above and below the branches. Newly acquired sequences of H. pterocaulis and H. subcapitata are highlighted in bold.

Figure 5: The majority rule consensus tree based on Bayesian inference analysis based on trnL-F sequences with PP values (> 0.50) and BSMP values (>50%) shown above and below the branches. Newly acquired sequences of H. pterocaulis and H. subcapitata are highlighted in bold.