A revised cytotaxonomy of the genus Tulbaghia (Alliaceae)

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A
Fig. 22a — Diagrammatic representation of the six nucleolar
chromosome types (N.O.R.'s) in Tulbaghia drawn according to
their relative size.
Type A: occurs in 13 species and is a medium sized chromosome
with a submedian centromere and with the N.O.R. located
in an intercalary position.
Type B: occurs, in combination with type A, only in one species
(T. acutiloba Harv.) and is the second longest of the complement:
the N.O.R. is located in the short arm in an intercalary
position.
Type C: occurs in two species (T. capensis L. and T. alliacca L.
f.) and is a subterminal chromosome and the second longest of
the karyotype. The N.O.R. is located distally on the short arm.
Type D: occurs in five species and is usually the shortest of the
complement with a subterminal centromere. The N.O.R. is located
terminally on the short arm and often carries an heterochromatic
"satellite" of various sizes.
Type E: occurs in one species (T. montana Vosa) and is a medium
sized chromosome with a submedian centromere. The
N.O.R. is located terminally on its long arm. Type F: occurs, in
combination with type A, in two species (T. rhodesica Fries and
T. cameroni Baker) and is the longest of the complement with a
submedian centromere: the N.O.R. is located in an intercalary
position very near the centromere.
Fig. 22b — Diagrammatic representation of the haploid karyotypes
of Tulbaghia. One species for each karyotype is illustrated
and drawn in accordance with its relative size). Group 1:
T. capensis L. (karyotype C); Group 2: T. dregeana Kunth
(karyotype A); Group 3: T. transvaalensis Vosa (karyotype AA);
Group 4: T. acutiloba Harv. (karyotype AB); Group 5: T. coddii
Vosa & Burbidge (karyotype D); Group 6: T. montana Vosa
(karyotype E); Group 7: T. rhodesica Fries (karyotype AF).
VOS