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Volume IV (1988) - Flora of New Zealand Naturalised Pteridophytes, Gymnosperms, Dicotyledons
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Galinsoga Ruiz & Pav.

GALINSOGA Ruíz Lopez et Pavón

Annual herbs. Lvs opposite, simple, usually serrate, 3-veined. Capitula pedunculate, in loose to congested dichasial cymose clusters. Involucral bracts in 1-3 rows. Receptacle conic; scales present. Outer florets ♀, ligulate, white to reddish or purple. Inner florets ⚥, tubular. Achenes dimorphic. Ray achenes flattened; pappus of laciniate scales, longer on one side, reduced to hairs, or 0. Disc achenes usually subterete; pappus of subulate to lanceolate, obtuse to aristate, laciniate scales, reduced to bristles, or 0.

Key

1
Pappus scales of at least the outer disc achenes subulate, mostly obtuse at apex; pappus of ray achenes 0, or reduced to simple or laciniate scales < 0.7 mm long
1. *parviflora
Pappus scales of disc achenes lanceolate, aristate at apex; pappus of ray achenes conspicuous, laciniate, c. 1 mm long
2. *quadriradiata

14 spp., Mexico, C. and S. America. Naturalised spp. 2.

Galinsoga has been revised recently by Canne, J. M., Rhodora 79 : 319-389 (1977), and that treatment is followed here. Ripe frs are essential for identification and can usually be found on flowering plants.

Fig. 23. Galinsoga, achenes of outer disc florets. A G. parviflora; B G. quadriradiata. © All rights reserved. [Image: 4X4F]
Fig. 23. Galinsoga, achenes of outer disc florets. A G. parviflora; B G. quadriradiata. © All rights reserved. [Image: 4X4F]
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