Spiraea tomentosa var. tomentosa

WeedyIllustratedEndemic
Synonyms: Spiraea glomerata Rafinesque S. parvifolia Rafinesque
Treatment appears in FNA Volume 9. Treatment on page 403.

Inflorescences 300–15,000+-flowered, flowers or fruits 12–20 per cm of branches. Pedicels 0.1–0.5 mm. 2n = 36.


Phenology: Flowering Jul–Sep; fruiting Aug–Oct.
Habitat: Wetlands, woodland borders with moist acidic soil
Elevation: 0–400 m

Distribution

V9 673-distribution-map.jpg

N.B., N.S., Ont., P.E.I., Que., Conn., Del., Maine, Md., Mass., N.H., N.J., N.Y., Pa., R.I., Vt., Va., W.Va., in n, c Europe

Discussion

Forms with white petals have been identified as forma albiflora Macbride; plants with rose petals are assigned to forma tomentosa. The chromosome count of 2n = 36 by J. T. Baldwin (1951) was for forma albiflora.

Selected References

None.

Lower Taxa

None.
densely white +  and gray tan or rusty +
glabrous +  and puberulent +
Richard Lis +
Linnaeus +
reddish +  and dark-brown gray or gray-black +
not +  and exfoliating +
compound +  and simple +
opposite +  and alternate +
cuneate +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
ovatelanceolate +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
1cm +  and 2.5cm +
glabrate +  and tomentose +
N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, Maine +, Md. +, Mass. +, N.H. +, N.J. +, N.Y. +, Pa. +, R.I. +, Vt. +, Va. +, W.Va. +, in n +  and c Europe +
not +  and aggregated +
0–400 m +
000+-flowered +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
unisexual +  and bisexual +
tomentose +  and arachnoid +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
000+-flowered +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
tomentose +  and glabrous +
list +  and count +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
coriaceous +
not +  and aggregated +
not +  and aggregated +
Wetlands, woodland borders with moist acidic soil +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glabrous +  and hairy +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
(2-)3-1000+-flowered +
axillary +  and terminal +
crassinucellate +
compound +  and simple +
deciduous +
craspedodromous +
coarsely serrate +  and crenate +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
branching +  and 000+-flowered +
5cm +  and 30cm +
glabrous +  and hairy +
150 +  and 15 +
3 cm30 mm <br />0.03 m <br /> (20 cm200 mm <br />0.2 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Jul–Sep +  and fruiting Aug–Oct. +
adnate +, free +, connate +  and distinct +
not arillate +
fusiform;oblong +
2mm +  and 4mm +
deciduous +  and persistent +
free +  and distinct +
reflexed +, erect +, ascending +  and spreading +
triangular +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
2 +  and 4 +
Weedy +, Illustrated +  and Endemic +
free +  and distinct +
1 times petal length +
shorter or longer +
nectariferous +
reddish-brown +  and brown +
decumbent +  and prostrate +
erect +  and ascending +
5 +  and 20 +
discoid +  and capitate +
deciduous +  and persistent +
distinct +
subterminal +  and terminal +
not elongate +
hairy +  and glabrous +
Spiraea glomerata +  and S. parvifolia +
Spiraea tomentosa var. tomentosa +
Spiraea tomentosa +
variety +
inconspicuous +
reduced +