Galinsoga

Ruiz & Pavón

Fl. Peruv. Prodr.,110, plate 24. 1794

Common names: Quickweed
Etymology: For Mariano Martínez de Galinsoga, 1766–1797, court physician and director of the Botanic Garden, Madrid
Found in FNA Volume 21. Treatment on page 180. Mentioned on page 6, 177, 181.
Annuals, 2–62 cm. Stems erect. Leaves cauline; opposite; petiolate; blades (3-nerved) lanceolate to broadly ovate, margins entire or serrulate to serrate, faces glabrate to densely pilose. Heads radiate or discoid, in ± cymiform arrays. Involucres hemispheric to campanulate, 2.5–6 mm diam. Phyllaries persistent or falling, 6–9[–16] in 2[–3] series (elliptic, lance-ovate, oblong, or ovate, outer shorter, herbaceous or scarious, margins entire or minutely laciniate). Receptacles conic, paleate (paleae persistent or falling, scarious, proximal broadly elliptic to obovate, often connate at bases or nearly to apices, united in groups of 2–3 to adjacent proximal phyllary, each complex often enclosing and shed with a ray cypsela; distal persistent or falling, lanceolate to obovate, entire or 2- or 3-lobed, convex to conduplicate). Ray florets [0–](3–)5(–8)[–15], pistillate, fertile; corollas white or dull white to pinkish [purplish] (tubes pilose, laminae quadrate-obovate to oblong, lobes 0–3). Disc florets 5–50[–150], bisexual, fertile; corollas yellow, tubes (pilose) shorter than cylindric throats, lobes 5, deltate (anthers yellow; style-branch apices acute). Cypselae obconic to obpyramidal, glabrous or strigose (rays often shed with subtending phyllary plus 2–3 adjacent paleae); pappi 0, or persistent, of 5–20, white or gray, fimbriate, sometimes aristate scales. x = 8.

Distribution

North America, Mexico, West Indies, Bermuda, Central America, South America, introduced in Europe, Asia, Africa, Atlantic Islands, Pacific Islands, Australia.

Discussion

Species 15–33+ (2 in the flora).

Galinsoga is closely related to Sabazia Cassini of Mexico and South America and to at least some members of Alloispermum Willdenow, primarily from South America. Galinsoga might best be treated as a single larger genus including Alloispermum and Sabazia (J. M. Canne 1978; J. L. Panero et al. 1999).

Key

1 Phyllaries persistent; inner paleae 3-lobed, lobes 1/3+ total lengths, acute; disc pappi 0, or of 15–20 often gray, sometimes white, linear, fimbriate, obtuse scales 0.5–2 mm Galinsoga parviflora
1 Phyllaries falling; inner paleae entire or 2- or 3-lobed, lobes to 1/3 total lengths, blunt; disc pappi 0, or of 1–5 or 14–20 white, lanceolate to oblanceolate, fimbriate, sometimes aristate, scales Galinsoga quadriradiata
Facts about "Galinsoga"
AuthorJudith M. Canne-Hilliker +
Common nameQuickweed +
EtymologyFor Mariano Martínez de Galinsoga, 1766–1797, court physician and director of the Botanic Garden, Madrid +
IllustratorYevonn Wilson-Ramsey +
Referencecanne1977a + and canne1978a +
Taxon nameGalinsoga +
Taxon parentAsteraceae (tribe Heliantheae) subtribe Galinsoginae +
Taxon rankgenus +
VolumeVolume 21 +