Dittrichia

Greuter

Exsicc. Genav. Conserv. Bot. Distrib. Fasc. 4: 71. 1973.

Etymology: For Manfred Dittrich, b. 1934, German botanist
Treatment appears in FNA Volume 19. Treatment on page 473. Mentioned on page 40, 471.
 TaxonIllustrator 
FNA19 P53 Pulicaria paludosa.jpegPulicaria paludosa
Dittrichia graveolens
Inula helenium
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Annuals [perennials], mostly 20–130 cm (glandular, viscid). Leaves mostly cauline (at flowering), alternate; sessile; blade margins entire or dentate [serrate]. Heads radiate, in racemiform or paniculiform arrays. Involucres ± campanulate, 3–8 [–10+] mm diam. Phyllaries persistent (spreading to reflexed in fruit), in 3–4 series, unequal. Receptacles flat, smooth or alveolate, epaleate. Ray-florets (6–) 10–12 (–16), pistillate, fertile; corollas yellow, aging reddish, laminae 2–7 mm. Disc-florets 8–20+; corollas yellow, aging reddish, lobes 4–5. Cypselae ellipsoid to terete (abruptly constricted distally; usually glandular distally); pappi persistent (fragile), of basally connate, barbellate bristles in 1 series. x = 9, 10.

Distribution

Introduced; Mediterranean, also in Asia, Africa, Australia

Discussion

Species 2 (1 in the flora).

Dittrichia viscosa (Linnaeus) Greuter [Inula viscosa Linnaeus, Cupularia viscosa (Linnaeus) Godron & Grenier] was collected in the late 1800s as a ballast weed in Florida, New Jersey, and Pennsylvania. It does not appear to have become naturalized at any of those sites (A. Cronquist 1980; J. E. Arriagada 1998).

Selected References

None.

... more about "Dittrichia"
scarious +
ovate +  and lanceovate or linear +
paniculiform +  and racemiform +
indeterminate +  and determinate +
Robert E. Preston +
Greuter +
decurrent +
compound +  and simple +
reddish +  and yellow +
ellipsoid +  and terete +
fertile +  and bisexual +
Mediterranean +, also in Asia +, Africa +  and Australia +
For Manfred Dittrich, b. 1934, German botanist +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
campanulate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
deltate +
serrate +, dentate +  and entire +
2-carpellate +
persistent +
Exsicc. Genav. Conserv. Bot. Distrib. Fasc. +
bearing subulate enations +, hairy +  and bristly +
alveolate +  and smooth +
flat;convex +
exalbuminous +
prostrate +  and ascending +
appendaged +  and truncate +
papillate +
Compositae +
Dittrichia +
Asteraceae tribe Inuleae +
20 cm200 mm <br />0.2 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
tree +, vine +, shrub +  and subshrub +