28.
Solidago macrophylla
Banks ex Pursh, Fl. Amer. Sept. 2: 542. 1813.
Large-leaved goldenrod , verge d'or à grandes feuilles
Aster thyrsoideus
(E. Meyer) Kuntze;
Solidago macrophylla
var.
thyrsoidea
(E. Meyer) Fernald;
S. mensalis
Fernald;
S. thyrsoidea
E. Meyer
Plants
20—105 cm; rhizomes short, thick, woody.
Stems
usually 1, erect, strigose in arrays.
Leaves:
basal and proximal cauline narrow-ing abruptly to elongated petioles, blades spatulate to lanceolate or ovate, 60—120(—150) × 14—45(—65) mm, gradually reduced distally, margins serrate (teeth 4—17), abaxial faces glabrous, glabrous or hairy along nerves, adaxial glabrous or sparsely strigose; mid to distal cauline petiolate to sessile, abruptly to gradually tapering to short broadly winged petiole-like bases, blades lanceolate, 22—46(—57) × 8—20(—29) mm, bases rounded, margins entire to slightly serrate, apices acute to acuminate, faces glabrous or sparsely hairy.
Heads
2—110+ (1—10 per branch) in leafy, racemiform or short, axillary and terminal racemiform-paniculiform clusters, lateral branches erect, 4—43 cm.
Peduncles
5—25 mm, densely short hispido-strigose; bracteoles 0—3, linear.
Involucres
campanulate, (8.6—)9.5—11.5(—12.5) mm.
Phyllaries
in 2—3 series, sometimes weakly unequal, glabrate, margins ciliate; outermost ovate, 3—5(—7) mm, acuminate, innermost lanceolate, 1-nerved, tapering to rounded tip.
Ray florets
7—13; laminae (4—)4.5—6.5 × 1—2 mm.
Disc florets
14—29; corollas (4.4—)5—6 mm; lobes 1—2 mm.
Cypselae
(± linear-obconic) 1.4—4.4 mm, glabrous;
pappi
(3.7—)5—6.5(—7.3) mm.
2
n = 18.
Flowering Aug—Sep. Sandy and gravelly soils, rocky ledges, and outcrops, open areas in woods and thickets; 0—1000+ m; St. Pierre and Miquelon; N.B., Nfld. and Labr. , N.S., Ont., P.E.I., Que.; Maine, N.H., N.Y., Vt.
Solidago
×
calcicola
(Fernald) Fernald (
S
.
virgaurea
Linnaeus var.
calcicola
Fernald) is considered to be a hybrid between
S. macrophylla
and possibly a member of subsect.
Triplinerviae
.
