Eurybia saxicastelli

(J. J. N. Campbell & Medley) G. L. Nesom

Phytologia 77: 261. 1995.

Common names: Rockcastle aster
EndemicConservation concern
Basionym: Aster saxicastelli J. J. N. Campbell & Medley Sida 13: 277, figs. 1, 2. 1989 (as saxicastellii)
Treatment appears in FNA Volume 20. Treatment on page 372. Mentioned on page 366, 367.

Plants 40–120 cm; in clones; rhizomes elongate, strong. Stems 1, erect, strict (slightly flexuous distally), simple, glabrous, distally ± villosulous (arrays). Leaves cauline; proximal withering by flowering, narrowly winged-petiolate, blades broadly oblanceolate or elliptic to obovate, smaller than mid; mid and distal winged-petiolate (5–30 mm), broadly elliptic to oblanceolate, (70–) 90–140 × 40–50 (–60) mm, reduced distally, bases cuneate, with 4–5 pairs of marked veins, margins coarsely serrate (teeth 1–4 mm), slightly revolute, scabrous, apices acuminate; abaxial faces glabrescent, adaxial sparsely pilose, mainly on veins. Heads 1–10, borne singly or in corymbiform arrays. Peduncles sparsely pilose; bracts 0–1, foliaceous, remotely serrulate. Involucres campanulate, 7–11 mm, shorter than pappi. Phyllaries 32–36 in 4–5 series, broadly oblong, strongly unequal, scarious, dark green zones wide, from 1/2 distally, margins hyaline, narrow, erose, densely ciliate, apices appressed or often slightly squarrose, obtuse to subacute, faces glabrous, eglandular. Ray-florets 10–30; corollas pale white to pale blue, 10–15 × 1.5–2 mm. Disc-florets 10–20; corollas yellow turning pinkish, ca. 4.5–5 mm, tubes longer than funnelform throats, lobes spreading, triangular, ca. 1.5 mm. Cypselae tan, fusiform, cylindric, 5–6 mm, ribs 7–11, stramineous, faces ± strigose; pappi of pale stramineous (clavate) bristles 5–7 mm, shorter than to ± equaling disc corollas. 2n = 54.


Phenology: Flowering late summer–fall.
Habitat: Back edge of spring-flooded, summer-dry, sandstone boulder–cobble river bars with shrubby vegetation
Elevation: (600–)1000–1500 m

Discussion

Of conservation concern.

Eurybia saxicastelli is known only from the Rockcastle River of Kentucky (J. J. N. Campbell and M. E. Medley 1989) and Tennessee.

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 saxicastelli"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Luc Brouillet +
(J. J. N. Campbell & Medley) G. L. Nesom +
cuneate +
indurate +
Aster saxicastelli +
winged-petiolate +
elliptic;obovate +
reduced +
rugulose +  and muricate +
barbellulate +  and barbellate +
pale stramineous +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Rockcastle aster +
not 2-lipped +  and actinomorphic +
yellow turning pinkish +, pale white +  and pale blue +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
7-12(-18)-nerved +
beaked +, 2-ribbed +  and 5-ribbed +
cylindric +  and fusiform +
fertile +  and bisexual +
fertile +  and bisexual +
Ky. +  and Tenn. +
(600–)1000–1500 m +
strigose +  and glabrous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Back edge of spring-flooded, summer-dry, sandstone boulder–cobble river bars with shrubby vegetation +
in corymbiform arrays +  and singly +
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 />) +
campanulate +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
petiolate +  and sessile +
triangular +
7 cm70 mm <br />0.07 m <br /> (9 cm90 mm <br />0.09 m <br />) +
5 cm50 mm <br />0.05 m <br /> (6 cm60 mm <br />0.06 m <br />) +
9 cm90 mm <br />0.09 m <br /> (14 cm140 mm <br />0.14 m <br />) +
broadly elliptic +  and oblanceolate +
40mm +  and 50mm +
2-carpellate +
barbellulate +  and barbellate +
pinkish +, yellowish +, tan +, tawny +  and cinnamon +
persistent +
unequal +
Flowering late summer–fall. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
stramineous +
7 +  and 11 +
exalbuminous +
Endemic +  and Conservation concern +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Eurybia saxicastelli +
species +
ampliate +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
dark green +