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| Typhonium boonmae K.Z.Hein, P.Saensouk & Saensouk, in P. Saensouk, S. Saensouk, Hein, Rakarcha et Chanthavongsa, 2026. |
Abstract
A species new to science, Typhonium boonmae K.Z.Hein, P.Saensouk and Saensouk, is described and illustrated from Saraburi and Lop Buri Provinces, central Thailand. A detailed description, color plates, comparisons with similar taxa, phenology, distribution, ecology, and a preliminary conservation status assessment are provided.
Keywords: colluvial deposit, Indochina, pedatisect leaf blade, Typhonium bognerianum, Typhonium watanabei
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| Typhonium boonmae sp. nov. (A) Excavated flowering individuals, (B) leaf blade of mature leaf (left showing adaxial surface, right showing abaxial surface), (C) leaf blade of first seasonal leaf (left showing adaxial surface, right showing abaxial surface), (D) leaf blade of juvenile leaf (left showing adaxial surface, right showing abaxial surface), (E) inflorescence at pistillate anthesis (left showing front view, middle showing back view, right showing side view), (F) spadix at pistillate anthesis (nearside of spathe artificially removed), (G) detail of spadix showing pistillate zone, sterile interstice, and staminate zone (nearside of spathe artificially removed). Scale bars: (A) = 5 cm, (B), (C), (E), and (F) = 2 cm, (D) = 1 cm, (G) = 5 mm. Photos by T. Boonma and K. Z. Hein. |
Typhonium boonmae K.Z.Hein, P.Saensouk & Saensouk sp. nov.
Diagnosis: A species similar to T. bognerianum J.Murata and Sookch. (Hetterscheid et al. 2001) (Fig. 3A) and T. watanabei J.Murata, Sookch. and Hett. (Murata et al. 2002) (Fig. 3C) in having pedatisect leaf blades with five to seven narrowly linear lobes and similar inflorescence morphology. Typhonium boonmae differs from T. bognerianum by having a stigma narrower than the ovary (versus stigma wider than the ovary), staminodes arranged in a single whorl accompanied by an upper incomplete whorl (versus staminodes arranged in 6–7 whorls), and a sessile appendix (versus stipitate appendix). Typhonium boonmae differs from T. watanabei by having filiform staminodes with acute apices (versus clavate-fusiform staminodes with obtuse or rounded apices), a staminate zone diameter equal to the diameter of the appendix at its base (versus appendix base wider than staminate zone), and a pale yellow to pinkish-orange appendix (versus blackish-grey appendix).
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| Typhonium boonmae sp. nov. (A) Mature flowering individuals in a clump in situ, (B) inflorescences in situ, left one at post-staminate anthesis and right one at pistillate anthesis. Photos by T. Boonma and K. Z. Hein. |
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| Details of spadices of Typhonium species with pedatisect leaf blades having narrowly linear lobes (spathe artificially removed). (A) T. bognerianum, (B) T. boonmae sp. nov., (C) T. watanabei, (D) T. vietnamense, (E) T. lineare, (F) T. pallescens, (G) T. edule. Photos by K. Z. Hein ((A), (B), (C), (F) and (G), Nguyen Van Canh (D), and Vuong Ba Truong (E)). |
Piyaporn Saensouk, Surapon Saensouk, Khant Zaw Hein, Sarayut Rakarcha and Khamfa Chanthavongsa. 2026. Studies on Typhonium (Araceae – Areae) of Thailand VI: Typhonium boonmae sp. nov. from central Thailand. Nordic Journal of Botany. DOI: doi.org/10.1002/njb.05154 [31 August 2026]
