Eurybia furcata

(E. S. Burgess) G. L. Nesom

Phytologia 77: 259. 1995.

Common names: Forked aster
Endemic
Basionym: Aster furcatus E. S. Burgess in N. L. Britton and A. Brown, Ill. Fl. N. U.S. 3: 358, fig. 3738. 1898
Treatment appears in FNA Volume 20. Treatment on page 372. Mentioned on page 366, 373.

Plants (30–) 50–120 cm; strongly in clones or scattered clumps, eglandular; rhizomes elongate, fleshy. Stems 1–5+, erect, simple, ± flexuous distally (± ridged from decurrent leaf-bases), glabrate proximally, sparsely villous distally. Leaves basal and cauline (grayish green abaxially), bases often oblique, margins serrate, veins prominent, abaxial faces scabrous, adaxial hirsute; basal and proximal cauline withering by flowering (rosettes produced in late-season, absent in spring), short-petiolate, petioles winged, sheathing, blades ovatelanceolate, 40–130 × 20–90 mm, bases rounded to subcordate, apices obtuse to acute; mid short-petiolate, narrowly winged, wings revolute, bases dilated, sheathing, ciliate, blades ovate to lanceovate, 100–120 (–150) × (30–) 60–80 mm, gradually reduced distally, bases shallowly cordate or truncate to rounded, margins sharply serrate, teeth mucronate, apices acuminate; distal (arrays) subpetiolate or sessile, ovate, 8–70 × 4–23 mm, bases sheathing or clasping. Heads 4–32+ in flat-topped, corymbiform arrays. Peduncles 0.5–3 (–5) cm, villous; bracts 0–3. Involucres campanulate, 6–8 (–10) mm, much shorter than pappi. Phyllaries ca. 40 in 5 series, oblong (outer) to linear-lanceolate (inner), strongly unequal, membranous, bases indurate and low-keeled or rounded abaxially, green zones in distal 1/4–1/3, obovate, poorly defined, margins hyaline, scarious, villoso-ciliate, inner often purplish, apices appressed, obtuse to rounded, faces villous, eglandular. Ray-florets (12–) 15–20; corollas white, sometimes becoming pink or lavender, 12–18 × 1–2.5 mm. Disc-florets 25–35+; corollas cream or light yellow becoming purple, 6–7 (–8) mm, slightly ampliate, tubes cylindric, lengths about twice funnelform throats, lobes erect, lanceolate, 0.8–1.2 mm (glabrous). Cypselae brown, fusiform, (2.5–) 3–3.5 (–4) mm, ribs 8–10 (–12), crowded, stramineous to tan, faces ± strigillose; pappi of tawny (apically sometimes clavellate) bristles 6–7 mm, equaling or slightly shorter than disc corollas. 2n = 18.


Phenology: Flowering late Jul–Oct.
Habitat: Calciphile, ± open habitats (± shade intolerant), limestone, sandstone and dolomite areas, mostly n-facing slopes, seepy bluffs, moist deciduous woods, especially along streams, sometimes disturbed sites
Elevation: 200–600 m

Distribution

V20-855-distribution-map.gif

Ark., Ill., Ind., Iowa, Mich., Mo., Wis.

Discussion

D. H. Les et al. (1991b) studied the population genetics of this restricted taxon, and Les et al. (1992) its distribution and autecology in Wisconsin. J. A. Reinartz and D. H. Les (1994) showed that the species is developing self-compatibility in response to small populations.

Eurybia furcata is uncommon throughout its range and is considered endangered or threatened in all states where it occurs; it is known only from historic records in Arkansas. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

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... more about "Eurybia furcata"
not tailed +, rounded +  and obtuse +
winged +  and short-petiolate +
distinct +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
subequal +
scarious +
20mm +  and 90mm +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
flat-topped +
Luc Brouillet +
(E. S. Burgess) G. L. Nesom +
clasping +, sheathing +, winged +  and short-petiolate +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
rounded +, low-keeled +  and truncate +
indurate +
20mm;90mm +
Aster furcatus +
winged +  and short-petiolate +
12 cm120 mm <br />0.12 m <br /> (15 cm150 mm <br />0.15 m <br />) +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
10 cm100 mm <br />0.1 m <br /> (12 cm120 mm <br />0.12 m <br />) +
ovate;lanceovate +
reduced +
60mm;80mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Forked aster +
not 2-lipped +  and actinomorphic +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
light yellow becoming purple +, cream +, lavender +, pink +  and white +
1.2 cm12 mm <br />0.012 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
ampliate +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
7-12(-18)-nerved +
beaked +, 2-ribbed +  and 5-ribbed +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
sessile +  and subpetiolate +
0.8 cm8 mm <br />0.008 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (?) +  and 2.3 cm23 mm <br />0.023 m <br /> (?) +
Ark. +, Ill. +, Ind. +, Iowa +, Mich. +, Mo. +  and Wis. +
200–600 m +
strigillose +  and villous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Calciphile, ± open habitats (± shade intolerant), limestone, sandstone and dolomite areas, mostly n-facing slopes, seepy bluffs, moist deciduous woods, especially along streams, sometimes disturbed sites +
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 />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
campanulate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
lanceolate +
winged +  and short-petiolate +
2-carpellate +
barbellulate +  and barbellate +
pinkish +, yellowish +, tan +, tawny +  and cinnamon +
persistent +
unequal +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged +  and short-petiolate +
40mm;130mm +
flowering +  and withering +
cauline +  and proximal +
obtuse +  and acute +
20mm;90mm +
Flowering late Jul–Oct. +
oblong +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
stramineous +  and tan +
8 +  and 10 +
exalbuminous +
flexuous +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Eurybia furcata +
species +
mucronate +
cylindric +
ampliate +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
scarious +