Annals of the Tsukuba Botanical Garden		date of publication
Annals of the Tsukuba Botanical Garden Volume 19		December 2000
	Tomohisa YUKAWA	P.1
	Holcoglossum tsii (Orchidaceae) -A New Species from China
	Yuji KURASHIGE , Nobuo KOBAYASHI and Tomohisa YUKAWA:	P.5
	A Magenta Flowered Form of Rhododendron tschonoskii var. tetramerum (Ericaceae) from Nagano, Japan
	Norio TANAKA:	P.7
	Pollination of the Genus Hydrilla (Hydrocharitaceae) by Waterborne Pollen Grains
	FUKUDA, Yoko and Norio TANAKA:	P.13
	Ex situ Conservation Studies of Primula sieboldii (Primulaceae) in the Tsukuba Botanical Garden: II. The Foraging Activity of Bombus diversus
	Goro KOKUBUGATA, Ken D. HILL and Katsuhiko KONDO:	P.19
	Chromosome Number and Karyotype of Two Cycas Species (Cycadaceae, Cycadales)