Arctanthemum

(Tzvelev) Tzvelev

Novosti Sist. Vyssh. Rast. 22: 274. 1985.

Etymology: Greek arktos, northern, and anthemon, flower, alluding to arctic range
Basionym: Dendranthema sect. Arctanthemum Tzvelev in V. L. Komarov et al., Fl. URSS 26: 384, 879. 1961
Treatment appears in FNA Volume 19. Treatment on page 535. Mentioned on page 31, 489, 534, 536.
 TaxonIllustrator 
FNA19 P62 Hulteniella integrifolia.jpegHulteniella integrifolia
Arctanthemum arcticum subsp. polare
Anthemis arvensis
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Perennials, (2.5–) 5–40 cm (taller in fruit, rhizomatous). Stems 1 (per rosette), ascending, usually simple, sometimes branched distally, glabrous or ± woolly (hairs basifixed). Leaves (not marcescent) basal and cauline; alternate; petiolate or sessile (distal); blades (± fleshy) fan-shaped, cuneate, or spatulate to narrowly lanceolate (distally), usually pinnati-palmately lobed (lobes 3–7), ultimate margins coarsely crenate, dentate (at apices of lobes), or entire (distally), faces ± woolly, glabrescent. Heads radiate, borne singly or in 2s or 3s. Involucres patelliform to hemispheric, 13–29 mm diam. Phyllaries persistent, (22–) 25–34 (–44) in 3 (–4) series, distinct, lanceolate to oblong, unequal, margins and apices (hyaline and colorless or brownish) scarious. Receptacles dome-shaped (glabrous), epaleate. Ray-florets (9–) 14–25 (–30), pistillate, fertile; corollas white, laminae lance-elliptic or elliptic to oblong or oblong-lanceolate. Disc-florets 140–360+, bisexual, fertile; corollas yellow, tubes broadly cylindric, throats campanulate, lobes 5, deltate (without resin sacs). Cypselae cylindro-obconic, ribs 5–8 (–10), faces glabrous, usually gland-dotted (pericarps without myxogenic cells or resin sacs; embryo-sac development monosporic); pappi 0. x = 9.

Distribution

n North America, n Eurasia (Russia), ne Asia (Pacific coast)

Discussion

Species 1.

C. Oberprieler et al. (pers. comm.) have placed Arctanthemum in their Asian grade (Group II) based on the study by L. E. Watson et al. (2002), distinct from Chrysanthemum (conserved name, syn. Dendranthema); Arctanthemum was also recognized as distinct by K. Bremer and C. J. Humphries (1993), who included Hulteniella in it. Hulteniella is kept separate here (as done by Oberprieler et al.). In both papers, three species were recognized within Arctanthemum, as done by N. N. Tzvelev when he established the genus. Later, Tzvelev (1987) placed A. hultenii in synonymy with A. arcticum subsp. polare (as here). The status of the remaining species, A. kurilense (Tzvelev) Tzvelev, which has not been reported for North America, appears dubious and the taxon is not recognized here; it may belong with A. arcticum subsp. arcticum.

... more about "Arctanthemum"
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Luc Brouillet +
(Tzvelev) Tzvelev +
decurrent +
Dendranthema sect. Arctanthemum +
compound +  and simple +
lobed;spatulate;narrowly lanceolate +
zygomorphic +, actinomorphic +  and (3-)5-merous +
yellow +  and white +
winged +  and monomorphic +
cylindro-obconic +
fertile +  and bisexual +
fertile +  and bisexual +
n North America +, n Eurasia (Russia) +  and ne Asia (Pacific coast) +
Greek arktos, northern, and anthemon, flower, alluding to arctic range +
gland-dotted +
glabrous +, glabrescent +  and woolly +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in 2s +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.3 cm13 mm <br />0.013 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
patelliform;hemispheric +
elliptic to oblong or oblong-lanceolate +  and lance-elliptic +
sessile +  and petiolate +
cauline +  and basal +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
25 +  and 34 +
Novosti Sist. Vyssh. Rast. +
bearing subulate enations +, hairy +  and bristly +
dome--shaped +
tzvelev1987a +
5 +  and 8 +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
papillate +
Compositae +
Arctanthemum +
Asteraceae tribe Anthemideae +
campanulate +
cylindric +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +