49.
Solidago ulmifolia
Muhlenberg ex Willdenow, Sp. Pl. 3: 2060. 1803.
Elm-leaf goldenrod
Aster ulmifolius
(Muhlenberg ex Willdenow) Kuntze
Plants
40—120 cm; caudices branching, woody.
Stems
usually 1, erect, glabrous, sparsely hairy in arrays.
Leaves:
basal when present similar to proximal cauline; proximal cauline often withering by flowering, tapering (sometimes rather abruptly) to short, winged petioles, blades ovate-lanceolate, 60—100(—150) × 30—40(—50) mm, thin, margins coarsely serrate, apices acute, abaxial faces hirsute on main nerves, adaxial sparsely hirsute to somewhat scabrous; mid to distal cauline subsessile to sessile, blades lanceolate, 20—50 × 5—20 mm, gradually reduced distally, margins entire.
Heads
20—150, secund, in open paniculiform arrays, proximal branches elongate and widely divergent, sometimes pyramidal-secund with proximal branches short and recurved-secund.
Peduncles
1.7—2 mm, sparsely to moderately short hispido-strigose, bracteoles 2—7, ovate, grading into phyllaries.
Involucres
3—4 mm.
Phyllaries
(16—18) in 2—3 series, unequal; outer ovate, acute, inner linear-lanceolate, obtuse to acute.
Ray florets
3—6; laminae 1—2 × 0.5—1 mm.
Disc florets
4—7; corollas 2.7—3 mm, lobes 0.5—1.1 mm.
Cypselae
1—1.6 mm, finely hairy;
pappi
± 2.5 mm.
Varieties 2 (2 in the flora): North America.
Solidago helleri
is possibly a hybrid of
S. ulmifolia
with
S. delicatula
.
