Biology Reference
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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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