Heteranthemis

Schott

Isis (Oken) 1818(5): 822. 1818.

Etymology: Greek heteros -, different, and anthemis, a genus name
Treatment appears in FNA Volume 19. Treatment on page 551. Mentioned on page 30, 487.
 TaxonIllustrator 
FNA19 P65 Tripleurospermum inodorum.jpegTripleurospermum inodorum
Heteranthemis viscidihirta
Argyranthemum foeniculaceum
Linny Heagy
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals, 10–30 (–100+) cm (plants sticky, viscid). Stems 1, erect, usually branched distally, hirtellous to pilosulous (hairs basifixed, some gland-tipped). Leaves mostly cauline; alternate; petiolate or sessile; blades obovate to oblong (bases sometimes ± clasping), often pinnately lobed, ultimate margins usually dentate, rarely entire, faces hirtellous to pilosulous (some hairs gland-tipped). Heads radiate, borne singly or in 2s or 3s. Involucres hemispheric or broader, 12–25+ mm diam. Phyllaries persistent, 20–30+ in 2–3+ series, distinct, ovate or obovate to lance-deltate or lanceolate (not keeled abaxially, usually each with central resin canal), unequal, margins and apices scarious (tips of inner usually dilated). Receptacles convex to conic, epaleate. Ray-florets 13–21+, pistillate, fertile; corollas yellow, laminae ± linear. Disc-florets 40–80 (–100+), bisexual, fertile; corollas proximally ochroleucous, distally yellow, tubes cylindric (usually gland-dotted), throats funnelform, lobes 5, deltate. Cypselae dimorphic: outer 3-angled (each angle ± winged, wings ± spine-tipped); inner ± compressed (adaxial angles ± winged, wings ± spine-tipped); ribs 0, faces glabrous (peric) arps without myxogenic cells or resin sacs; embryo-sac development tetrasporic; pappi 0. x = 9.

Distribution

Introduced; Mediterranean Europe, n Africa, widely adventive elsewhere

Discussion

Species 1.

Selected References

None.

"broader" is not a number.

... more about "Heteranthemis"
not tailed +  and obtuse +
scarious +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
Schott +
decurrent +
compound +  and simple +
lobed;obovate;oblong +
zygomorphic +, actinomorphic +  and (3-)5-merous +
yellow +  and ochroleucous +
winged +  and monomorphic +
obcompressed +, compressed +, 3-angled +, columnar +  and prismatic +
fertile +  and bisexual +
fertile +  and bisexual +
Mediterranean Europe +, n Africa +  and widely adventive elsewhere +
Greek heteros -, different, and anthemis, a genus name +
glabrous +, hirtellous +  and pilosulous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in 2s +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
hemispheric +
sessile +  and petiolate +
deltate +
entire +  and dentate +
2-carpellate +
persistent +
20 +  and 30 +
Isis (Oken) +
bearing subulate enations +, hairy +  and bristly +
convex;conic +
exalbuminous +
hirtellous +  and pilosulous +
appendaged +  and truncate +
papillate +
Compositae +
Heteranthemis +
Asteraceae tribe Anthemideae +
cylindric +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +