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Page 16 · DO #965 · 319_Love_Bx1FF10r
- Collection
-
Áskell Löve (1916–1994) papers
- Item/Folder
-
"Gentianinae"
- Digital Object
-
DO #965,
page 16
- Collection-level dates
- 1950–1987
Page transcription
15.
genus is that by Weda (1966), who reported 2n = 46 chromosomes, a number indicating,
if exact, the basic number x = 23. It also ought to be mentioned here that we
feel there are sufficiently strong morphological and palynological indications
that the section Stenophora of Gentians would be most adequately accommodated
under the genus Tripterispermum, although cytological evidence is missing.
The genus Megacodon H. Sm. of Smith (1936) includes two Himalayan species
the cytology of which remains unknown. Toyokuni (1965a) argued that this taxon
would be better placed as a subgenus of Gentiana, close to its typical section.
Since palynological evidence (Nilsson 1967a) is clearly in favor of a separate
status for these species, they ought to be kept as a distinct genus for a time.
The small genus Jaeschkea Kurt with three species in the Himalayas, of which
one species is known to be tetraploid with 2n = 20 chromosomes (x = 5), is
closely related to Gentiana s.str., although clearly distinct from it.
Several reports of the basic number x = 11 from various species of the
genus Halenia Borckh., which includes perhaps fifty species of mountains and
tundras of Asia and both the Americas, indicate that this is a natural genus,
despite various subdivisions proposed by Grisebach (1845), Gilg (1917), and
Allen (1933).
The genus Swertia L. traditionally includes more than one hundred species
inhabiting alpine regions of Eurasia, North America and Africa. It is a confused
group as far as its morphology goes, and Nilsson (1967a) found great heterogeneity
in the pollen morphology even within some of the accepted sections. The genus
has been divided into ten genera by various taxonomists of the last two
centuries (Agathodes D. Don, Anagallidium Griseb., Frasera Walt., Henricea Lem.,
Monobothrium Hochst., Ophelia D. Don, Rellesta Turcz., Szukinia Turcz.,
Stellera Turcz., and Swertia L.) of which the monographer Grisebach
(1845) regarded five as acceptable. Most later authors
