Environmental Adaptation of Tropical Pasture Plants by L. R. Humphreys

By L. R. Humphreys

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CROSS-FERTILISED LEGUMES Two cultivated pasture legumes, Desmodium intortum and D. uncinatum, which have a significant level of outcrossing, are of especial interest. Both species exhibit considerable inter-plant variation in morphology and vigour. Seed formation is entomophilous, and tripping of flowers is necessary for fertilisation, in contrast to the legumes mentioned in the last section. 15 (Gibson, 1972). In the open untripped flower the staminal column (F) is restrained downwards within the overlapping keel petals (G) by thickenings (C) on the inside of the wing petals.

E, - ~........... .......... Range of first·flowering dates . ......... .... 35 ... 14 13 .... ---'-e-_-e-e CIvil ......... 12 c: '" >- . ...... twilight .... -. D. 2 Dates of floral initiation (FI), first flower appearance (FA), and range of first flowering dates for Stylosanthes guianensis selections in relation to day length (sunrise-sunset), day length including civil twilight, maximum temperature and minimum temperature (Bryant and Humphreys, 1976). Climatic conditions during the late summer and autumn showed intermittently declining temperatures and decreasing day length.

Capitata and S. montevidensis, which, on average, occurred in warmer areas than S. - High altitudes ana latitudes t SUBTROPICAL " I \ I ~ OJ ~ ... S ! > :J ~ '" 0 8.. (ij ,, I ~ e ... 0. S I I ~ ... c ~ ",,,, J I " ... '5.. -o •• \ I (ij I '" e .. Ox \ J I I I • '\ OJ .. 3 S. guianensis M-A groups S. hamata M-A groups humilis M-A groups and subgroups s. Ox Oxley C E S V Cook Endeavour Schofield Verano Climatic background of some of the Stylosanthes M-A groups and cultivars (Burt and Williams, 1975).

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