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A NEW SPECIES OF HOYA (ASCLEPIADACEAE)
FROM SOUTHERN THAILAND
MANIT KIDYOO & OBCHANT THAITHONG
Department of Botany, Faculty of Science, Chulalongkorn University, Pathumwan,
Bangkok 10330, Thailand; e-mail: kidyoo_m@yahoo.co.th
SUMMARY
In addition to the knowledge of the genus Hoya in Thailand a new species from Peninsular Thailand
is recorded. This new species, Hoya balaensis, is described and illustrated.
Key words: Asclepiadaceae, Hoya, Thailand, new species.
INTRODUCTION
Hoya R.Br. is a genus of the Milkweed family, Asclepiadaceae. Hoyas are found in
Asian and Australian regions. The genus consists of at least 100 species occurring from
China, Southeast Asia to Oceania (Ping-tao et al., 1995). It is easily recognized from
other climbing epiphytes with opposite leaves by having milky sap in all parts, rather
thick and fleshy leaves, flowers in umbelliform, and a star-shaped corona. Presently,
the genus Hoya is being studied for the Flora of Thailand Project; there are probably
40 species (Thaithong, 2001). A new species of Hoya is found in southern Thailand.
After intensive studies of herbarium specimens deposited at AAU, BM, K, L, P and
SING, we decided to describe a new species.
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