Biology Reference
In-Depth Information
Table 6.5
Data on
Aplectrum
(Magrath
2002
)
Character
Aplectrum hyemale
Plant height (cm)
18-50
Raceme length (cm)
3-7 × 1.5
Flower number
6-10
a
Dorsal sepal (mm)
10-15 × 1.8-4
Lateral sepals (mm)
10-15 × 1.8-4
Lateral petals (mm)
9-13 × 1.8-3.5
Lip (mm)
9-12 × 7-9
Column (mm)
7 × 2
a
Luer (
1975
)
Fig. 6.11
Aplectrum hyemale
. (
a
) Flower, front view; (
b
) Lip, flattened, scale bars = 2.5 mm
Compatibility and Breeding System
Hogan (
1983
) conducted a 2-year study of
A. hyemale
in Trelease Woods and
Brownfield Woods northeast of Urbana in east central Illinois. He found that artificial
geitonogamous pollination resulted in 100% fruit set, indicating full self-compatibility
at the level of fruit production. Moreover, 71% of enclosed, unmanipulated flowers
and 47% of enclosed, emasculated flowers set fruit, indicating the occurrence of
autogamy and possibly, agamospermy. Although present elsewhere in our flora (e.g.,
Spiranthes
), agamospermy is unusual in the orchid family (van der Pijl and Dodson
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