Slender Vervain - Verbena rigida
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Species Description
Rare garden escape. First recorded in the wild in Britain in 1937 from Bristol.
Stace 4:
Verbena rigida Spreng. (V. venosa Gillies & Hook.) - Slender Vervain.
Perennial; stems erect, to 60cm; differs from V. bonariensis in leaves mostly oblong-ovate; spikes mostly >3cm in fruit, with even longer peduncles; calyx mostly >3cm; corolla-tube about 9mm; and bracts longer than calyx; many spikes elongated to >4cm at fruiting, becoming only loosely clustered; (2n=42). Neophyte-casual; garden escape on tips; occasional in Britain, mainly South England; South America.
Key:
- Stem-leaves sessile, at most sharply serrate
- Bracts longer than calyx; many spikes elongated to >4cm at fruiting, becoming only loosely clustered