Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii

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Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii

XIONG Zhi-Ting, CHEN Sing-Chi, HONG De-Yuan

Received:1900-01-01 Revised:1900-01-01 Online:1998-01-10 Published:1998-01-10
Contact: XIONG Zhi-Ting

Abstract

Abstract:

Hemerocallis dumortierii, H. esculenta and H. middendorfii were considered

to belong to a biological complex, and were treated as different varieties of the same species,

H. dumortierii. The present authors observed and compared the karyotypes of H. esculen-

ta and H. middendorfii. Two plant samples for each of the species were studied. One sam-

ple of H. esculenta was from Wuán County, Hebei Province, at an altitute of 1000 m, the

other from Shennongjia, Hubei Province, altitute 2100 m. The two samples of H. middendorfii were respectively from Antu County, at an altitute of 700 m, and Tonghua, altitute

500 m, in Jilin Province. The karyotypes are 2n＝2x=22=12m+8sm+2T for H. escu-

lenta, while 2n＝2x＝22=10m+6sm+4st+2T for H. middendorfii. The karyotypical

difference between the two taxa was obviously not intraspecific but interspecific. Based on

the karyotype data as well as the morphological and phytogeographical data available, it is

considered that H. esculenta and H. middendorfii should be recognized as different

species, instead of different varieties of the same species as in literature, and that H. mid-

dendorfii is more advanced than H. esculenta.

Key words: Hemerocallis esculenta, H．middendorfii, Karyotype

XIONG Zhi-Ting, CHEN Sing-Chi, HONG De-Yuan. Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii[J]. .

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Karyotype Evidence for Distinguishing Between Hemerocallis esculenta and H. middendorfii

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