Eurybia avita

(Alexander) G. L. Nesom

Phytologia 77: 259. 1995.

Endemic
Etymology: Alexander’s rock aster
Basionym: Aster avitus Alexander Castanea 4: 60. 1939
Treatment appears in FNA Volume 20. Treatment on page 378. Mentioned on page 367, 377, 379.

Plants 30–50 (–80) cm; in clumps, eglandular; rhizomes short, creeping, ± woody in age. Stems 1–5+, erect to ascending, simple, strict, slender, stiff, proximally glabrous or glabrate, distally hirtello-puberulent. Leaves basal and cauline, firm, blades (1-nerved) linear to lance-linear or oblong-linear (grasslike), 25–140+ × 2–5 mm, ± coriaceous, bases sheathing, margins entire to remotely serrulate-spinose, indurate, remotely scabrous, spines thickened, apices acute, revolute, faces glabrous; basal and proximal cauline often withering by flowering, bases marcescent, ± long-petiolate; mid and distal progressively sessile and reduced. Heads 3–15+ in narrow, flat-topped corymbiform arrays. Peduncles densely hirtellous; bracts 1–2, usually immediately subtending heads. Involucres cylindro-campanulate, 7–9 mm, shorter than pappi. Phyllaries 30–55+ in 4–5 series, unequal, chartaceous, bases indurate, margins narrowly hyaline, scabrous, erose, fimbriate, apices appressed or reflexed, acute, sometimes acuminate (some outer), mucronate, marginally thickened, faces glabrous; outer lance-oblong, rounded, apical zones dark green, flat; inner linear-oblong, apical zones pale green, restricted to broadly acute tips. Ray-florets 8–20; corollas bluish white to lavender or deep violet, 5–10 × 1–1.7 mm. Disc-florets 15–45; corollas yellow, 5.5–7 mm, barely ampliate, tubes shorter than narrowly funnelform throats, lobes erect, triangular, 0.6–0.7 mm. Cypselae tan, fusiform, ± compressed, ca. 5 mm, ribs 7–10 (–12) (stramineous, broad), strigillose; pappi of cinnamon to sordid bristles 5.5–6 mm, equaling disc corollas. 2n = 18.


Phenology: Flowering late summer–early fall.
Habitat: Shallow sandy soils around edges of granite flatrock outcrops
Elevation: 100–500 m

Discussion

Of conservation concern.

Eurybia avita is known from Stone Mountain (the type location, where it is now extirpated according to R. Kral 1983, vol. 2) and granite flatrocks in Georgia, and from Pickens County in South Carolina, where it is imperiled; it is presumed extirpated from North Carolina (www.natureserve.org). Kral mapped the species; he underlined its similarities to both E. surculosa and E. paludosa and the need for further studies of its relationships.

Selected References

None.

Lower Taxa

None.

"[" 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 "Eurybia avita"
not tailed +, rounded +  and obtuse +
distinct +
reflexed +  and appressed +
subequal +
scarious +
usually triangular +  and linear +
pale green +  and dark green +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
flat-topped +
Luc Brouillet +
(Alexander) G. L. Nesom +
long-petiolate +
marcescent +
decurrent +
indurate +
Aster avitus +
compound +  and simple +
oblong-linear +, linear +  and lance-linear +
2.5 cm25 mm <br />0.025 m <br /> (14 cm140 mm <br />0.14 m <br />) +
oblong;spatulate oblanceolate or lanceolate +
reduced +
2mm;5mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
cinnamon +  and sordid +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
not 2-lipped +  and actinomorphic +
yellow +, bluish white +  and lavender or deep violet +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
ampliate +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
7-12(-18)-nerved +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +  and fusiform +
fertile +  and bisexual +
fertile +  and bisexual +
Ga. +, N.C. +  and S.C. +
100–500 m +
Alexander’s rock aster +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Shallow sandy soils around edges of granite flatrock outcrops +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.4 cm14 mm <br />0.014 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
cylindro-campanulate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
triangular +
entire +  and remotely serrulate-spinose +
fimbriate +
2-carpellate +
barbellulate +  and barbellate +
pinkish +, yellowish +, tan +, tawny +  and cinnamon +
persistent +
unequal +
Flowering late summer–early fall. +
oblong +  and oblanceolate lanceolate or linear +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
strigillose +
7 +  and 10 +
exalbuminous +
erect +  and ascending +
1 +  and 5 +
slender +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Eurybia avita +
species +
ampliate +
cauline +  and proximal +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +