Xanthisma sect. Havardii

(R. C. Jackson) D. R. Morgan & R. L. Hartman

Sida 20: 1410. 2003.

Basionym: Haplopappus sect. Havardii R. C. Jackson Univ. Kansas Sci. Bull. 46: 479. 1966
Synonyms: Machaeranthera sect. Havardii (R. C. Jackson) R. L. Hartman
Treatment appears in FNA Volume 20. Treatment on page 393. Mentioned on page 383, 384.

Annuals, 25–60 cm; taprooted. Leaf-blades serrate or dentate, often coarsely so, teeth blunt or terminating in stiff callosities, not bristle-tipped. Heads radiate. Involucres broadly turbinate. Phyllaries in 5–7 series, appressed, stramineous, linear to narrowly oblong, mostly 1–2 mm wide, unequal, proximally rigid, distal 1/5–1/2 with green patch or strip, not expanded distally, apices narrowly obtuse to broadly acute, not bristle-tipped, densely stipitate-glandular. Receptacles: pit borders laciniate, teeth or setae mostly distinct, 0.1–0.5 mm. Ray corollas yellow. Cypselae monomorphic, oblong or narrowly ellipsoid, sometimes slightly asymmetric, flattened laterally, 2.5–3 mm, walls thin, 12–14-ribbed, barely discernible, faces sparsely silky; pappi of white, filiform (not basally flattened) bristles 5–7 mm in 2–3 poorly defined series. x = 4.

Distribution

sc United States

Discussion

Species 1.

Selected References

None.

Lower Taxa

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Xanthisma sect. Havardii"
not tailed +, rounded +  and obtuse +
not bristle-tipped +
distinct +
stipitate-glandular +
narrowly obtuse;broadly acute +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Ronald L. Hartman +
(R. C. Jackson) D. R. Morgan & R. L. Hartman +
decurrent +
indurate +
Haplopappus sect. Havardii +
lanceolate;oblanceolate or spatulate +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not 2-lipped +  and actinomorphic +
yellow +, purple +, pink +  and white +
flattened +, ellipsoid +  and oblong +
fertile +  and bisexual +
fertile +  and bisexual +
sc United States +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
ovate +  and orbiculate or depressed-elliptic +
unequal +
dentate +  and serrate +
sessile +  and short-petiolate +
cauline +  and basal +
triangular +
serrate +  and entire +
2-pinnatifid +, pinnatifid +  and dentate +
2-carpellate +
usually whitish +  and brown or reddish-brown +
persistent +
30 +  and 90 +
flattened +
reflexed +, spreading +  and appressed +
linear +  and narrowly oblong +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
sprawling +, spreading +  and erect +
hispid +  and hispidulous villous or stipitate-glandular +
green patch +
expanded +
appendaged +  and truncate +
papillate +  and smooth +
Machaeranthera sect. Havardii +
Xanthisma sect. Havardii +
Xanthisma +
section +
not bristle-tipped +
distinct +
terminating in stiff callosities +  and blunt +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
discernible +
25 cm250 mm <br />0.25 m <br /> (60 cm600 mm <br />0.6 m <br />) +