Oclemena ×blakei

(Porter) G. L. Nesom

Phytologia 77: 264. 1995.

Common names: Blake’s aster aster de Blake
Basionym: Aster nemoralis var. blakei Porter Bull. Torrey Bot. Club 21: 311. 1894
Synonyms: Aster ×blakei (Porter) House Aster nemoralis var. major Peck
Treatment appears in FNA Volume 20. Treatment on page 81. Mentioned on page 78, 79.

Plants 35–65 cm (forming clones; rhizomes subsuperficial, elongate, becoming woody). Stems 1, erect, strict, thin to stout (1.5–3 mm diam.), villosulous, ± glandular distally. Leaves 20–40, equally dispersed, proximal often withering by flowering; sessile; blades oblanceolate to oblong, 20–80 × 4–16 mm, only slightly reduced distally, bases cuneate, margins flat to slightly revolute, slightly to coarsely serrate, scabrous to ciliate, teeth minute or small and acuminate, apices acute, abaxial faces scabrous, adaxial pilose and ± glandular. Heads 2–35+ in corymbiform arrays, seldom borne singly, branches ascending, at ± acute angles with stems. Peduncles 2.5–7 cm, densely villosulous; bracts 2–5, linear, villosulous. Involucres 6.2–8 mm. Phyllaries linear-lanceolate to linear, sparsely villosulous, sometimes glabrescent, seldom sparsely gland-dotted. Ray-florets 8–20; corollas white to pink, 12.5–16.5 × 0.8–1.6 mm. Disc-florets 10–26; corollas ampliate, 6.1–6.2 mm, glabrous; tubes shorter than very narrowly campanulate throats, strigillose, lobes slightly reflexed, 0.5–1 mm. Cypselae tan, fusiform-obconic, ± compressed, 1.9 mm, ribs 5–8, faces glabrous, ± densely gland-dotted; pappi of pinkish to whitish bristles in 3 series, about ± equal to disc corollas. 2n = 18.


Phenology: Flowering late Jul–Oct.
Habitat: Forest-bog ecotones, shrubby bogs with spruce, larch, Spiraea, Myrica gale, or Ilex mucronata, sometimes shrubby edges of lakes or creeks
Elevation: 0–700 m

Distribution

V20-154-distribution-map.gif

N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Conn., Maine, Mass., N.H., N.J., N.Y., R.I., Vt.

Discussion

Oclemena ×blakei is the widespread, frequent, mostly F1 hybrid between O. acuminata and O. nemoralis, which has been confirmed by morphologic, chemical (R. B. Pike 1970; L. M. Hill and O. M. Rogers 1970, 1973; L. Brouillet and J.-P. Simon 1981), and isozyme data (Brouillet and Simon 1980). Hybrid populations also often include backcrosses to both parents as well as later generation hybrids and introgressed parental individuals. Hybrid clones may survive in areas where neither parent is found today. Some reports of this hybrid are misidentified Eurybia radula, which it superficially resembles.

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 "Oclemena ×blakei"
stipitate-glandular +, puberulent +  and glabrous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Luc Brouillet +
(Porter) G. L. Nesom +
cuneate +
not indurate +
Aster nemoralis var. blakei +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
mid +  and proximal +
oblanceolate;oblong +
reduced +
0.4 cm4 mm <br />0.004 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
rugulose +  and muricate +
villosulous +
pinkish +  and whitish +
Blake’s aster +  and aster de Blake +
not 2-lipped +  and actinomorphic +
white +  and pink +
1.25 cm12.5 mm <br />0.0125 m <br /> (1.65 cm16.5 mm <br />0.0165 m <br />) +
ampliate +
shorter to longer +
0.61 cm6.1 mm <br />0.0061 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +  and fusiform-obconic +
fertile +  and bisexual +
fertile +  and bisexual +
N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Maine +, Mass. +, N.H. +, N.J. +, N.Y. +, R.I. +  and Vt. +
0–700 m +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Forest-bog ecotones, shrubby bogs with spruce, larch, Spiraea, Myrica gale, or Ilex mucronata, sometimes shrubby edges of lakes or creeks +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
cylindro-campanulate +
0.62 cm6.2 mm <br />0.0062 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
short-petiolate +  and sessile +
dispersed +
20 (?) +  and 40 (?) +
triangular +  and lanceolate +
serrate +  and entire +
scabrous +  and ciliate +
flat +  and slightly revolute +
2-carpellate +
persistent +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Flowering late Jul–Oct. +
glabrescent +  and villosulous +
linear-lanceolate +  and linear +
bearing subulate enations +, hairy +  and bristly +
planoconvex +
5 +  and 8 +
fleshy +  and fibrous +
exalbuminous +
villosulous +
appendaged +  and truncate +
papillate +  and smooth +
Aster ×blakei +  and Aster nemoralis var. major +
Oclemena ×blakei +
Oclemena +
species +
campanulate +
acuminate +
small +  and minute +
strigillose +
ampliate +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
5 cm50 mm <br />0.05 m <br /> (90 cm900 mm <br />0.9 m <br />) +