Flora of New Zealand Series

yellow gromwell

Annual herb. Stems up to 1 m high, branched, often with long straight and short curly hairs. Basal and lower cauline lvs to c. 20 × 3 cm, linear-lanceolate to linear-oblong, hispid with hairs pulvinate at base; base attenuate; apex ± obtuse and mucronate; upper lvs similar but smaller. Infl. with basal bracts; pedicels very short. Calyx (1)-2-4-(4.5) mm long at flowering, to 5 mm long at fruiting; lobes linear-lanceolate, hispid. Corolla 4-8 mm long, yellow; tube ampliate, glabrous within; limb 2-3 mm diam., suborbicular. Nutlets c. 2.5 mm long, with longitudinal muricate ridges and transversely rugose furrows.

N.: rare; S.: Canterbury and Otago.

Chile 1906

Locally common in drier areas, especially on arable land.

FL Sep-Nov-(Feb).

The sp. is illustrated in Fig. 40. Allan (1940) recorded yellow gromwell from C. Otago only. It has now increased greatly, probably because of resistance to herbicides. It has previously been known in N.Z. as A. hispida, and A. angustifolia.