Xanthisma junceum

(Greene) D. R. Morgan & R. L. Hartman

Sida 20: 1406. 2003.

Basionym: Haplopappus junceus Greene Bull. Calif. Acad. Sci. 1: 190. 1885
Synonyms: Machaeranthera juncea (Greene) Shinners
Treatment appears in FNA Volume 20. Treatment on page 390. Mentioned on page 384.

Subshrubs, 25–100 cm; caudices branched, taproots 2–10+ cm. Stems 3–15+, branched in distal 1/2, slender and wiry, glabrous. Leaves: basal often withering by flowering, 20–35 × 6–12 mm, pinnatifid; cauline evenly spaced, blades oblong to linear, scalelike, 4–6 × 1–2 mm (except proximalmost), markedly reduced distally, margins usually entire, faces glabrous. Peduncles minutely glandular, if stipitate, then minutely so; bracts 5–25, imbricate, grading into phyllaries. Involucres hemispheric (narrowed at bases), 0.5–0.8 × 1–1.2 cm. Phyllaries in 5–6 series, oblong to linear-oblanceolate, 1.5–6.5 mm, apices acute, tipped by white bristle, faces minutely stipitate-glandular. Ray-florets 15–25; corollas yellow, tubes 3.5–4 mm, laminae 5–6 × 1.5–2.5 mm. Disc-florets 25–40+; corollas 4.8–6.3 mm. Cypselae narrowly obovoid to oblanceoloid, 1.5–2.5 mm, nerves 12–18, moderately tawny hairy; pappi tawny, 3.5–6 mm, a few abaxial bristles to 1/3 of longest. 2n = 8, 16.


Phenology: Flowering summer–fall.
Habitat: Rocky, dry slopes
Elevation: 100–1000 m

Distribution

V20-888-distribution-map.gif

Calif., Mexico (Baja California), Mexico (Sonora)

Discussion

Xanthisma junceum is reported from Arizona, but no specimen has been seen; as it is coastal in distribution, the report is likely based on a misidentified specimen.

Selected References

None.

Lower Taxa

None.

"spreading" is not a number.

... more about "Xanthisma junceum"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Ronald L. Hartman +
(Greene) D. R. Morgan & R. L. Hartman +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
decurrent +
indurate +
Haplopappus junceus +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
scale-like;oblong;linear +
reduced +
1mm;2mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not 2-lipped +  and actinomorphic +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.63 cm6.3 mm <br />0.0063 m <br />) +
narrowly obovoid +  and oblanceoloid +
fertile +  and bisexual +
fertile +  and bisexual +
flattened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Calif. +, Mexico (Baja California) +  and Mexico (Sonora) +
100–1000 m +
stipitate-glandular +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky, dry slopes +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
ovate +  and orbiculate or depressed-elliptic +
unequal +
1.5mm;2.5mm +
serrate +  and entire +
sessile +  and short-petiolate +
cauline +  and basal +
bristle-tipped +
triangular +
2-pinnatifid +, pinnatifid +  and dentate +
2-carpellate +
persistent +
30 +  and 90 +
flattened +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering summer–fall. +
light green +  and stramineous +
appressed +  and squarrose +
oblong +  and linear-oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
connate +  and distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
connate +  and distinct +
laciniate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
connate +  and distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
unequal +
wiry +  and branched +
sprawling +, spreading +  and erect +
3 +  and 15 +
slender +
green patch +
expanded +
appendaged +  and truncate +
papillate +  and smooth +
Machaeranthera juncea +
Xanthisma junceum +
Xanthisma sect. Sideranthus +
species +
bristle-tipped +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
perennial +  and annual +
3 cm30 mm <br />0.03 m <br /> (80 cm800 mm <br />0.8 m <br />) +
4 +, 3 +  and [2 +