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| Impatiens rostrata Souvann. & Lanors., in Souvannakhoummane, Newman, Lanorsavanh & Suksathan, 2021. |
ABSTRACT
One new species, Impatiens rostrata Souvann. & Lanors., is described and illustrated, and nine new records of Impatiens for Laos are reported. A lectotype of Impatiens rubrostriata Hook.f. is designated, and two new synonyms are made.
Keywords: Indonesia, Laos, lectotype, limestone flora, new distribution, new species, taxonomy
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| Impatiens rostrata Souvann. & Lanors., sp. nov. A, Plant with flower from above; B, flower, lateral view; C, flower, front view; D, outer lateral sepals; E, inner lateral sepals; F, lower sepal; G, dorsal petal; H, lateral united petals; I, ovary and stamens; J, fruits. Scale bars: A, 5 cm; B-H and J, 1 cm; I, 5 mm. Drawn from Lanorsavanh et al. SL 1782 (A-C, from living plant; D-I, from spirit material) by K. Souvannakhoummane. |
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| A-F, Impatiens rostrata Souvann. & Lanors., sp. nov.: A, plant with flowers; B, flowers at branch apex; C, partial front view of flower; D, lateral view of flower; E, fruit; F, seed. G and H, Impatiens bonii: G, plant with flower; H, front view of flower. Scale bars: A-E, G and H, 1 cm; F, 1 mm. Photographs: A-E, S. Lanorsavanh; F, K. Souvannakhoummane; G and H, T. N. Bon. |
Impatiens rostrata Souvann. & Lanors., sp. nov.
Impatiens sect. Semeiocardium (Zoll.) S.X.Yu & Wei Wang, Cladistics 32, 2: 191 (2015).
Similar to Impatiens bonii Hook.f. in having connate lateral united petals and 4-carpellate ovary, and in overall flower shape, but differs in having leaf bases cordate to cuneate (not rounded), flower yellow with white lobe apex, red spots inside (not red patch inside with violet lobe apex), lateral sepals 4 (not 2), simple spur (not bifid), dorsal petals oblong-elliptic (not obcordate), seeds ovoid-oblong (not globose).
Etymology. The epithet is from the Latin, rostratus, meaning ‘beaked’, referring to the beak-shaped spur.
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A–C, Impatiens kerriae: A, plant with flower; B, front view of flower; C, lateral view of flower. D–F, Impatiens napoensis: D, plant with flower; E, front view of flower; F, lateral view of flower. G–I, Impatiens parishii: G, plant; H, front view of flower; I, lateral view of flower. Scale bars: 1 cm. Photographs: A–C, K and L, K. Phoutthavong; D–J, K. Souvannakhoummane. A–C, Impatiens rubrostriata: A, plant with flowers; B, front view of flower; C, lateral view of flower. D–F, Impatiens lobbiana: D, plant with flower; E, front view of flower; F, lateral view of flower. G–I, Impatiens tigrina, red form: G, plant with flower; H, front view of flower; I, lateral view of flower. Scale bars: 1 cm. Photographs: A–F, K. Souvannakhoummane; G–J, S. Lanorsavanh; K and L, K. Phoutthavong. |
New records:
Impatiens damrongii Shimizu, Acta Phytotax. Geobot. 24: 38 (1969);
Impatiens drepanophora Hook.f., Rec. Bot. Surv. India 4: 17 (1905);
Impatiens kamtilongensis Toppin, Bull. Misc. Inform. Kew 1920: 356 (1920);
Impatiens kerriae Craib, Bull. Misc. Inform. Kew 1926, 4: 161 (1926);
Impatiens lobbiana Turcz., Bull. Soc. Imp. Naturalistes Moscou 32, 1: 270 (1859);
Impatiens napoensis Y.L.Chen, Acta Phytotax. Sin. 38, 6: 557, f. 1 (2000);
Impatiens parishii Hook.f., Fl. Brit. India 1: 456 (1875);
Impatiens rubrostriata Hook.f., Hooker’s Icon. Pl. 30: pl. 2954 (1911);
Impatiens tigrina Suksathan & Triboun, Gard. Bull. Singapore 61, 1: 177 (2009).
K. Souvannakhoummane, M. F. Newman, S. Lanorsavanh and P. Suksathan. 2021. Impatiens rostrata (Balsaminaceae), A New Species from Khammouane Province, Laos, and Nine New Records. Edinburgh Journal of Botany. 78; DOI: 10.24823/EJB.2021.362
