Friday, December 29, 2017

[Botany • 2017] Spathoglottis jetsuniae • A New and Striking Spathoglottis (Orchidaceae: Collabiinae), honoring Her Majesty the Queen of Bhutan


Spathoglottis jetsuniae N.Gyeltshen, K.Tobgyel & Dalström


Gyeltshen, Tobgyel & Daltröm, 2017

Abstract

A new, attractive and morphologically unique species of Spathoglottis is described, illustrated and compared with the most similar species. The new species is currently only known from two localities in southeastern Bhutan and differs distinctly from its closest relative, Spathoglottis hardingiana, by the glabrous pedicels, forward-curved acuminate apices of the petals, a yellow hypochile of the lip, two pairs of unequal callus “horns” and swellings, and a spirally coiled epichile of the lip, versus a densely pubescent inflorescence and pedicels, a pale purple hypochile, a single pair of erect and clavate, or“bubble-shaped”, callus swellings, and a projecting and narrowly triangular epichile of the lip for S. hardingiana. 

Keywords: Orchidaceae, Collabiinae, new species, Spathoglottis, Bhutan

Figure 5. The striking flowers of Spathoglottis jetsuniae.

 Photo by Nima Gyeltshen

Spathoglottis jetsuniae N.Gyeltshen, K.Tobgyel & Dalström, sp. nov.

Diagnosis. Spathoglottis jetsuniae is similar to S. hardingiana C.S.P.Parish & Rchb.f. (Fig.7), but differs by having sub-glabrous inflorescence, axis and pedicels, petals with abruptly acuminate apices curved forward, a yellow lip with a pair of spreading fleshy callus lobes and an additional, parallel pair of digitate, or “sausage-shaped”, callus structures above, and a narrow and coiled-up, strap-like mid-lobe. In contrast, S. hardingiana has distinctly pubescent inflorescence, axis, ovaries and pedicels, acute petals, a pale mauve lip with a single pair of thick and clavate, or bulbous, erect callus structures, and a porrect and narrowly triangular mid-lobe (Parish & Reichenbach 1875; Curtis’s Botanical Magazine 1904).

Distribution: Spathoglottis jetsuniae is so far only known from two localities in southeastern Bhutan. 

Eponomy: Spathoglottis jetsuniae is named in loving and respectful honor of Her Majesty the Queen Jetsun Pema Wangchuck of Bhutan, who has a dedicated and sincere interest in the protection of the environment and the wild flora and fauna of Bhutan.

Figure 7: Spathoglottis hardingiana from the Curtis’ Botanical Magazine, plate 7964 (1904).

Nima Gyeltshen, Kezang Tobgyel and Stig Daltröm. 2017. A New and Striking Spathoglottis (Orchidaceae: Collabiinae), honoring Her Majesty the Queen of Bhutan.  LANKESTERIANA. 17(3); 395–393.  

  

No comments:

Post a Comment