All Floras      Advanced Search
FNA Vol. 20 Page 162, 163,164, 165 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 20 | Asteraceae | Solidago

72. Solidago rigida Linnaeus, Sp. Pl. 2: 880. 1753.

Stiff-leaved goldenrod

Aster rigidus (Linnaeus) Kuntze; Oligoneuron rigidum (Linnaeus) Small

Plants 30–150 cm ; caudices branching, woody. Stems 1–10+, erect, stout, hairy. Leaves: basal and proximal cauline usually present at flowering, abruptly narrowed to long petioles, blades ovate to rhombic, 80–200 × 24–50 mm, firm, flat, margins entire to crenate, sometimes undulate, apices obtuse to acute, faces densely hairy; mid to distal cauline sessile, blades ovate, 30–50 × 15–17 mm, stiff, greatly reduced distally, margins entire or finely serrate, sometimes undulate, apices acute to obtuse. Heads 9–190, in corymbiform arrays, compact or branches long and spreading, densely hairy throughout. Peduncles 3–15 mm, strigillose-canescent, bracteoles 1–3, linear-lanceolate. Involucres campanulate, 6–8 mm. Phyllaries in 3–4 series, unequal, oblong, conspicuously striate (3–5 pronounced nerves), obtuse. Ray florets 6–13; laminae 1.4–5.4 × 1.2–1.9 mm. Disc florets 14–35; corollas 4.3–6.1 mm, lobes 0.6–1.1 mm. Cypselae (obconic) 0.8–1.7 mm (ribbed), glabrous or strigillose apically; pappi 3–4 mm.

Subspecies 3 (3 in the flora): North America.

Solidago rigida is divided into three subspecies with distinct morphologies and partially overlapping ranges. Intermediates occur between the subspecies in areas of sympatry.

1 Outer phyllaries glabrous; leaves and stems glabrous or ± hispid   72c Solidago rigida subsp. glabrata
+ Outer phyllaries strigillose; leaves and stems moderately to densely hispid or strigose   (2)
2 (1) Inner phyllaries glabrate to sparsely strigillose, oblong and rounded; plants robust (60–150 cm); arrays loose, open; leaves and stems coarsely hispid (fewer than 50 hairs/mm 2 )   72a Solidago rigida subsp. rigida
+ Inner phyllaries conspicuously strigillose, often linear; plants usually short (30–70 cm), sometimes taller; arrays compact; leaves and stems finely and densely hispido-strigose (more than 50 hairs/mm 2 )   72b Solidago rigida subsp. humilis


Related Objects  
  • Distribution Map
  • Map

     |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |