Wednesday, August 24, 2016

[Botany • 2014] Siliquamomum alcicorne • A New Species (Zingiberaceae) from southern Vietnam


Siliquamomum alcicorne 
Škorničk. & Trần H.Đ. sbg.org.sg

ABSTRACT 
Siliquamomum alcicorne (Zingiberaceae: Alpinioideae) from central Vietnam is described and illustrated here. It is compared to the other two species so far known in the genus, S. tonkinense and S. oreodoxa. A key to the three species and a map of their distribution are given. The genome size of each species has been estimated by FCM analysis. The occurrence of flexistyly in the genus Siliquamomum is reported here for the first time.

Keywords. Alpinioideae, flexistyly, flow cytometry, genome size, Siliquamomum oreodoxaSiliquamomum tonkinense, Vietnam, 2C value




Siliquamomum alcicorne Škorničk. & Trần H.Đ., sp. nov.
Similar to Siliquamomum tonkinense Baill. in its robust habit, but differs in having more leaves per leafy shoot (8–11 vs. 3–6), sessile leaf blades (vs. petiolate) and an anther which is deeply divided up to 1/3 from apex with two spathulate, green lobes (as opposed to an emarginate apex without a prominent anther crest).

TYPE: Vietnam, Kontum Province, Kon Plong Dist., Xã Hiếu, 14°38’57.7”N 108°24’57.7”E, 1223 m, 24 April 2012, J. Leong-Škorničková, Nguyễn Q.B., Trần H.Đ., E. Záveská JLS-1560 (holotype SING; isotypes E, PR, VNMN). (Fig. 1)


Key to the species of Siliquamomum
1a. Pseudostem with 3–6 leaves; petiole 2.5–9 cm long (northern Vietnam & southeastern Yunnan, China) ........................................................... S. tonkinense 
1b. Pseudostem with 8–13 leaves; petiole inconspicuous or up to 2 cm long ........... 2 

2a. Pseudostems up to 2 m long, petiole inconspicuous, anther with prominent spathulate crest-lobes above each theca (central Vietnam) ................ S. alcicorne 
2b. Pseudostems up to 0.9 m long, petiole up to 2 cm long, anther with minute sharp point above each theca (southern Vietnam) ......................................... S. oreodoxa


J. Leong-Škorničková, H.Đ. Trần, Q.B. Nguyễn and O. Šída. 2014. Siliquamomum oreodoxa (Zingiberaceae): A New Species from southern Vietnam. Gardens’ Bulletin Singapore. 66(1): 39–46.

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