Amauriopsis dissecta

(A. Gray) Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 34: 37. 1914.

Illustrated
Basionyms: Amauria dissecta A. Gray Mem. Amer. Acad. Arts, n. s. 4: 104. 1849
Synonyms: Bahia dissecta (A. Gray) Britton
Treatment appears in FNA Volume 21. Treatment on page 393.

Leaf lobes (3–) 7–25 (–75+), ovate to oblong or lanceolate to lance-linear, 4–12 (–25+) × (1–) 2–6 (–12+) mm. Involucres 5–7+ × 10–18+ mm. Ray laminae 5–10+ mm. Disc corollas 2.5–3 (–4+) mm, ± stipitate-glandular. Cypselae 2.5–4+ mm. 2n (= 3x) = 36.


Phenology: Flowering (Jun–)Aug–Sep(–Oct).
Habitat: Usually on sandy or gravelly soils, openings in pinyon-juniper, yellow pine, or spruce-fir forests
Elevation: 1600–2900 m

Distribution

V21-990-distribution-map.gif

Ariz., Calif., Colo., Nev., N.Mex., Tex., Utah, Wyo., Mexico (Baja California), Mexico (Chihuahua), Mexico (Coahuila), Mexico (Sonora)

Discussion

W. L. Ellison (1964) reported “n = 18, metaphase II,” based on observation of meiosis in a microsporocyte. D. J. Keil et al. (1988) noted that anthers are often abortive and meiosis is irregular and that seed set is usually high in A. dissecta. Keil et al. suggested that A. dissecta is an apomictic triploid derived from a cross between a diploid plant with n = x = 12 and a tetraploid plant (or unreduced gamete) with n = 2x = 24 so that for A. dissecta 2n = 3x = 36.

Some plants (from Arizona, Baja California, and New Mexico) with poorly developed ray corollas and ± hairy cypselae bearing pappi of 1–13 lance-linear to lance-subulate scales have been identified as belonging to Amauriopsis dissecta. Such plants may be hybrids resulting from crosses between A. dissecta and some other pappose species.

Selected References

None.

Lower Taxa

None.

... more about "Amauriopsis dissecta"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
(A. Gray) Rydberg in N. L. Britton et al. +
decurrent +
Amauria dissecta +
compound +  and simple +
lobed;deltate;ovate or oblong +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
stipitate-glandular +  and hairy +
hirtellous +  and glabrous +
4-angled +  and obpyramidal +
fertile +  and bisexual +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
stipitate-glandular +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
fertile +  and bisexual +
Ariz. +, Calif. +, Colo. +, Nev. +, N.Mex. +, Tex. +, Utah +, Wyo. +, Mexico (Baja California) +, Mexico (Chihuahua) +, Mexico (Coahuila) +  and Mexico (Sonora) +
1600–2900 m +
hirtellous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Usually on sandy or gravelly soils, openings in pinyon-juniper, yellow pine, or spruce-fir forests +
singly +  and radiant +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
ovate +  and oblong or lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cauline +  and basal +
lanceolate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
aristate +
Flowering (Jun–)Aug–Sep(–Oct). +
12 +  and 21 +
in N. L. Britton et al., N. Amer. Fl. +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
bearing subulate enations +, hairy +  and bristly +
distinct +
4 +  and 20 +
exalbuminous +
Illustrated +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Bahia dissecta +
Amauriopsis dissecta +
Amauriopsis +
species +
campanulate +  and cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
10 cm100 mm <br />0.1 m <br /> (80 cm800 mm <br />0.8 m <br />) +
shrub +  and subshrub +