Flora of North America species comparison

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Saxifraga paniculata

saxifrage paniculée, White Mountain saxifrage
Habit Plants forming cushionlike tufts, stoloniferous, rhizomatous.
Leaves

basal and cauline;

petiole absent;

blade oblong to obovate, unlobed, [5–]8–35[–50] mm, leathery-fleshy, margins finely serrate (teeth whitish), proximally ciliate, with lime-secreting hydathode (secretions obvious), apex obtuse to ± acute, surfaces glabrous.
Inflorescences

2–20-flowered, narrow, distally branched thyrses or cymes, sometimes solitary flowers, 6–40 cm, purple-tipped stipitate-glandular;

bracts sessile.
Flowers

sepals erect, (often reddish), oblong to ovate, margins eciliate, surfaces hairy;

petals white to cream or pink, sometimes orange- or purple-spotted, elliptic to oblong or obovate, 3–6 mm, longer than sepals;

ovary 1/2+ inferior.
2n

= 28.

Saxifraga paniculata
Phenology Flowering late spring–summer.
Habitat Rocky ledges and crevices, often calcareous areas
Elevation 0-1200[-2200] m (0-3900[-7200] ft)
Distribution
from FNA
ME; MI; MN; NH; NY; VT; MB; NB; NL; NS; NT; NU; ON; QC; Greenland; Europe; Atlantic Islands (Iceland)
[WildflowerSearch map]
[BONAP county map]
Discussion

C. Reisch (2008) studied the phylogeography of Saxifraga paniculata. North American populations originated postglacially from refugia south of the ice. Reisch suggested that North American populations may belong to subsp. laestadii (Neuman) T. Karlsson, found also in Iceland and northern Norway. The Manitoba report originates from Clearwater Lake (R. Humphrey s.n., 13 Sept. 1993, WIN 62868), where shaded, cool, calcareous cliffs provide suitable habitats that also host other eastern disjuncts (B. A. Ford, pers. comm.).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 137.
Parent taxa Saxifragaceae > Saxifraga
Sibling taxa
S. adscendens, S. aizoides, S. aleutica, S. bracteata, S. bronchialis, S. cernua, S. cespitosa, S. cherlerioides, S. chrysantha, S. debilis, S. eschscholtzii, S. flagellaris, S. hirculus, S. hyperborea, S. mertensiana, S. nathorstii, S. oppositifolia, S. radiata, S. rivularis, S. serpyllifolia, S. taylorii, S. tricuspidata, S. tridactylites, S. vespertina
Synonyms S. aizoön, S. aizoön var. neogaea, S. paniculata subsp. laestadii, S. paniculata subsp. neogaea
Name authority Miller: Gard. Dict. ed. 8, Saxifraga no. 3. 1768 ,
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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