Growth and Reproductive Strategy in VeronicaSpp.

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Abstract
Seed production, germination and plant growth form were studied in several species of Veronica. The objectives were to compare the reproductive strategies of annual and perennial species of Veronica which varied in their habitats and aggressiveness as weeds. ‘Reproductive effort’ was fairly similar for both annuals and perennials, falling within the commonly observed range for annual species. Seed number per capsule and the 100-seed weight were unaffected by the growth conditions but plant growth form was substantially modified in V. agrestis. The small-seeded Veronica species required light for germination and the winter annual V. hederifolia germinated much more vigorously after a low temperature treatment. The growth form, vigour and extent of adventitious root production and rapid seed germination of V. persica must be significant factors in the spread and establishment of this species.

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