Table Of ContentFebruary 2006 Joumal of Japanese Botany Vol. 81 No. 1 41
Notes
Yukie KATO，M akoto MOCHIDA and Hirokazu KOIKE: The Northernmost Locality of
Utricularia caerulea L. (Lentibulariaceae) in Japan
北限産地のホザキノミミカキグサ(加藤ゆき恵，持田 誠，小池宏和)
Utriculariα caerulea L. (Hozakino- Tsukigata town (Ishikari Subprefecture) in
mimikakigusa: Blue bladderwort) is an an- Hokkaido in recent years (Toyama and
nual insectivorous plant growing in Katsumata 1999) and is therefore listed in
oligotrophic wetlands. It is distributed from the Hokkaido Red List as‘Rare' (Hokkaido
Madagascar，t hrough westem India to Japan， 2001). In this way Tsukigata has been known
New Guinea and NE Australia (Kadono as the northemmost record until now
1993，Ta ylor 1995). Utricularia caerulea has (Komiya 2004).
been recorded throughout Jap an from Bibai city is located on the east of
Hokkaido to Okinawa but recently it is very Tsukigata town，a nd the Ishikari River runs
rare in Okinawa (Komiya and Shibata 2000). between these two towns (Fig. 2). Hoshino
Utricularia caeruleαis distinguished from a (1939) reported af lora of the Bibai peatland，
similar species，U . uliginosa Vahl. (Mura- but U. caerulea was not listed in the flora.
saki-mimikakigusa)，b y having peltate bracts The habitat of U. caerulea in Bibai is situ-
and scales on the scapes，in curved spurs and ated at about 1k m north and about 15 km
sepals covered with papillae (Kadono 1993， east of the habitat in Tsukigata. Therefore
Tamura 1981: Fig. 1). We discovered U. the bog in Bibai is the northemmost habitat
caeruleαin the bog at Bibai city，S orachi for this species at present. The plants grow in
Subprefecture，c entral Hokkaido in 2002. small，s hallow and muddy hollows and com-
This has proved to be the northemmost habi- prise av ery small population in the Bibai
tat so for discovered. bog.
Utricularia caerulea is distributed mainly The plants are very small. Scape erect，
in the southem part of Asia. In eastern Asia， solitary，ab out 10 cml ong，w ith af ew peltate
U. caeruleαis recorded in China (Li 1990)， scales. There are 2-3 flowers on each scape.
Korea (Lee 1996) and Japan. But there have Surfaces of the sepals and perica中 arecov-
been no records of U. cαerulea in Russia ered with papillae (Fig. 1). Both flowers and
(Steinberg 2000). The northemmost locality fruits were observed on September 11，2 002.
in China is Shandong Province (Li 1990) Papillae on the pericpsare not men-
紅
Hokkaido is located to north of Shandong tioned in the previous publications. But all
Province and Korean Peninsula，so Hokkaido specimens with fruits in SAPS (Herbarium
is the northemmost locality of U. caerulea. of Hokkaido University Museum) and SAPT
Native habitats of U. caerulea have been (Herbarium of Botanic Garden， The
decreasing in many prefectures in Jap an. Hokkaido University) have papillae on the
Five localities were recorded in Ishikari and pericarps. As U. caerulea is av ery wide-
Sorachi Subprefectures， in Hokkaido spread and extremely variable species
(Komiya and Shibata 1980，T oyama 1983， (Taylor 1989)，s o it might be better to inves-
Toyama and Katsumata 1999: Fig. 2) but the tigate this feature with larger number of
bogs where it grew have since disappeared specimens to identify its distribution within
following land development (Toyama and U. caerulea.
Katsumata 1999，K omiya and Shibata 2000). The environmental conditions around bogs
Utriculariαcaerulea was recorded only from providing the northemmost habitats of
42 植物研究雑誌第81巻第1号 平成18年2月
Fig. 1. Utricularia caerulea L. from the Bibai bog (Koike 02-0093，S APT). a: Whole pla n，.tb:
Flower with incurved spur. c: Part of infructescence. Sepals and peric訂pscovered with papillae.
d: Scales on the scape. Scale bar indicates 1m mf or ca nd d.
Utricularia caerulea seem to have become fecture，B ibai city，B ibai bog (北海道空知支庁美唄
more serious recently (Ts吋iiand Tachibana 市美唄湿原)， Sept. 11，2 002，H . Koike，Y . Kato，M .
2003，T achibana 2003). Conservation and Mochida & Y. Fujimura (Koike 02-00093，S APT);
Fukushima Pre ，.fShirakawa-cho (福島県白河町谷地)，
restoration of the bog vegetation is thus
September 23，1 940，T . Saito (Sugawara-Collection
highly necessaη. The specimen is kept in
20082，S APT); Kazusa (Chiba Pref.)，M obara-cho
SAPT. (上総茂原町)，July 29，1 910 (K. Miura s. n.，S APS);
ibid.，Ju ly 14，1 911 (K. Miura s. n.，S APS).
Utricularia caerulea L.， Sp. Pl. 18
(1753). Wew ish to express our sincere thanks to
Utriculariαracemosa Wall. ex Walp. in Professor Hideki Takahashi，T he Hokkaido
Meyen，O bserv. Bot. Nov. Acta 19: 401 University Museum and Mr. Sarwar A. K.
(1843); Komiya，S yst. Stud. Lent. 49 (1972). M. Golam，G raduate School of Agriculture，
Specimens examined: Hokkaido，S orachi Subpre- Hokkaido University for their kind sugges-
February 2006 Joumal of Japanese Botany Vo .l81 No. 1 43
Komiya S. 2004. Zetsumetsukigu no shokuchuu-
，....ーーーー『
o 5km shokubutsu ga jisei suru shitsugen to koshou
[Mires and Lakes where endangered plants grow].
TSUKIGATA Hopposanso 21: 8-12 (inJ apanese).
一-and Shibata C. 1980. Distribution of the
Lentibulariaceae in Japan. Bull. Nippon Dental
Univ.，G en. Educ. 9: 161-212.
一一一and一一-2000. Two terrestrial bladderworts，
BIBAI-city Utricularia bifida L. and U. caerulea L.
(Lentibulariaceae). Bull. Nippon Dental Univ.，
Gen. Educ. 29: 133-160 (in Japanese).
Lee T. N. 1996. Flora of Korea. 1265 pp. Kyo-Hak
Publishing，S eoul (in Korean).
Li Z. 1990. Utriculariaceae. In: Wang W.，P an K.，
Zhang Z.，Li Z.，T ao D. and Yin W. (eds.)，Fl ora
Reipublicae Popularis Sinicae 69: 582-605.
Science Press，B eijing (in Chinese).
Steinberg E. 1. 2000. Family CXLV II. Lentibulariaceae
Lindl. In: Schinschkin B. K.， Shetler S. G.，Fe t G.
N. and Mosyakin S. L. (edsよFloraof the USSR
23: 111-123. Science Publishers， Inc.， New
Hampshire.
Tachibana H. 2003. Wetland vegetation of Hokkaido
Fig. 2. Distribution of Utricularia caerulea L. in and its conservation. Papers in Commemoration of
Hokkaido. 20th Anniversary of Foundation of Maeda Ippoen
Foundation -Wetlands of Hokkaido. pp. 285-301.
Hokkaido University Press，S apporo (in Japanese).
Tamura M. 1981. Lentibulariaceae. In: Satake Y.，
tion. Wea lso thank Mr. Yoshiyasu Fujimura，
Ohwi J.，K itamura S.，W atari S. and Tominari T.
Graduate School of Agriculture，H okkaido
(eds.)，W ild Flowers of Japan，H erbaceous Plants
University and Dr. Osamu Nagata，N ational (including Dwarf Subshrubs) 3: 137-139. Heibon-
Agricultural Center for Hokkaido Region for sha，T okyo (inJ apanese).
their support in our field survey. Taylor P. 1989. The genus Utricularia -a taxonomic
monograph. 724 pp. HMSO，L ondon.
一一一 1995.Lentibulatiaceae. In: Dassanayake M. D.，
2002年に，北海道空知支庁美唄市の湿原におい
Fosberg F. R. and Crayton W. D. (eds). A Revised
てホザキノミミカキグサを採集した.これまでに
Handbook to the Flora of Ceylon 9: 173-201. A. A.
国内で報告されている分布の北限は石狩支庁樺戸
Balkema Publishers，B roodfield.
郡月形町であるが，新産地は月形町の自生地から
Toyama M. 1983. Hokkaido-nai ni okeru shokuchuu-
北に 1km，東に15km離れていることから，現在
shokubutsu no gunraku to seitai [Community and
自生が確認されている分布域の中では最北限とな
Ecology of the insectivorous plants in Hokkaido].
る.本種の生育環境は悪化していると考えられ，
Bull. Water Pl. Soc.，Jp n. 14: 12-14 (in Japanese).
本種の生育地を含めた高位泥炭地(ミズゴケ湿原)
一一一and Katsumata K. 1999. Hokkaido yori
植生の保全や復元が必要である.
Hozakino-mimikakigusa， Ko-tanukimo no
shinsanchi houkoku [New records of Utricularia
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