Biology Reference
In-Depth Information
Table 9.1
Data on
Isotria
(Mehrhoff and Homoya
2002
)
Character
Isotria verticillata
Isotria medeoloides
Plant height (cm)
4-40
4-25
Flower number
1(2)
1(2)
Dorsal sepal (mm)
34-67 × 2-4
12-25 × 2-3
Lateral sepals (mm)
34-67 × 2-4
12-25 × 2-3
Lateral petals (mm)
15-25 × 3-7
12-18 × 2-4
Lip (mm)
15-25 × 4-5
11-16 × 4-5
Column (mm)
8-10
8-10
Chromosomes (2
n
)
18
18
Fig. 9.1
Isotria verticillata
. (
a
) Upper part of stem and flower, front view, scale bar = 10 mm;
(
b
) Column, slightly oblique ventral view, scale bar = 2 mm.
an
anther,
ng
nectar guides,
ro
rostel-
lum,
sg
stigma; (
c
) Close-up of flower, front view, scale bar = 2 mm
Homoya
1977
; Mehrhoff
1980
) while those of
I. medeoloides
do not (Homoya
1977
;
Mehrhoff
1983
). Neither species makes nectar, but
I. verticillata
possesses apparent
pollination (nectar) guides (Mehrhoff
1983
). Individual flowers of
I. verticillata
remain
open for about 4-7 days with the flowering period for the population lasting about 2
weeks in North Carolina (Mehrhoff
1983
). Individual flowers of
I. medeoloides
bloom
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