Amberboa

(Persoon) Lessing

Syn. Gen. Compos., 8. 1832.

Etymology: Pre-Linnaean genus name Amberboi Vaillant, cited by Linnaeus in his original publication of Centaurea
Basionym: Centaurea subg. Amberboa Persoon Syn. Pl. 2: 481. 1807
Treatment appears in FNA Volume 19. Treatment on page 172. Mentioned on page 67, 84.
 TaxonIllustrator 
FNA19 P09 Arctium minus.jpegArctium minus
Acroptilon repens
Amberboa moschata
John Myers
John Myers
John Myers

Annuals or biennials, 20–70 cm; herbage not prickly, glabrate. Stems erect, usually branched from near bases. Leaves basal and cauline (distal smaller); petiolate (basal and proximal cauline) or sessile (distal cauline); blade margins dentate or ± lobed (basal) or entire to lobed (cauline). Heads ± radiant, borne singly. (Peduncles slender.) Involucres ovoid, 12–16 mm diam. Phyllaries many in several series, bases appressed, margins scarious, apices obtuse, inner with oblong, scarious appendages, these entire or spiny. Receptacles flat, epaleate, bearing setiform scales (“flattened bristles”). Florets many; corollas white to pink, purple, or yellow; outer sterile, corollas expanded, raylike, bilateral, 5–many-lobed; inner fertile, corollas actinomorphic; anther bases tailed, apical appendages oblong; styles branches: fused portions with basal nodes minutely hairy, distinct portions minute. Cypselae oblong, compressed, (apices denticulate), faces ribbed, wrinkled, with long, ascending hairs, basal attachment scars lateral, surrounded by whitish, swollen rims; pappi persistent, of many scales in several series, distinct, narrow [rarely 0]. x = 16.

Distribution

Introduced; Mediterranean region to c Asia

Discussion

Species 6 (1 in the flora).

Amberboa has often been included within Centaurea, from which it differs by cypselae each with a denticulate apex and a conspicuous rim around the basal scar. The chromosome base number x = 16 is higher than that in most species of Centaurea in a strict sense. Molecular phylogenetic studies of the relationships of Cynareae genera (A. Susanna et al. 1995) place Amberboa as sister to the remaining genera of the Centaureinae.

Lower Taxa

"fine" is not a number.

... more about "Amberboa"
scarious +
racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
David J. Keil +
(Persoon) Lessing +
decurrent +
Centaurea subg. Amberboa +
compound +  and simple +
more or less lobed or entire +  and lobed +
10-nerved or 20-nerved +  and rugose +
actinomorphic +  and raylike +
white +  and pink purple or yellow +
inner +  and outer +
5-many-lobed +
expanded +
compressed +  and oblong +
fertile +  and bisexual +
Mediterranean region to c Asia +
Pre-Linnaean genus name Amberboi Vaillant, cited by Linnaeus in his original publication of Centaurea +
wrinkled +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
singly +  and radiant +
indeterminate +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +, usually narrowly triangular +  and more or less linear +
entire +  and dentate +
usually lobed +  and dissected +
2-carpellate +
persistent +
papillate +  and smooth +
distinct +  and fused +
Syn. Gen. Compos., +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
gabrielian1996a +  and iljin1932a +
swollen +
setiform +
exalbuminous +
several;several +
appendaged +  and truncate +
dilated +  and swollen +
enlarged +
Compositae +
Amberboa +
Asteraceae tribe Cardueae +
biennial +  and annual +
fertile +  and sterile +
20 cm200 mm <br />0.2 m <br /> (70 cm700 mm <br />0.7 m <br />) +
tree +, vine +, shrub +  and subshrub +