Sibbaldia

Linnaeus

Sp. Pl. 1: 284. 1753.

,

Gen. Pl. ed. 5, 137. 1754.

Etymology: For Robert Sibbald, 1642–1722, professor of medicine at Edinburgh
Synonyms: Potentilla sect. Sibbaldia (Linnaeus) Hooker f. Potentilla subg. Sibbaldia (Linnaeus) Syme
Treatment appears in FNA Volume 9. Treatment on page 297. Mentioned on page 120, 274, 298, 299, 304.
 TaxonIllustrator 
FNA9 P23 Dasiphora fruticosa.jpegDasiphora fruticosa
Sibbaldia procumbens
Sibbaldiopsis tridentata
Marjorie C. Leggitt
Marjorie C. Leggitt
Marjorie C. Leggitt

Herbs, perennial, [0.1–] 0.2–1.5 (–2) [–3] dm, [subglabrous or] sparsely strigose to subappressed pilose [to densely tomentose or sericeous]; horizontal rootstocks branched, compact, woody. Stems 1–10+, prostrate to ascending [or erect], green to reddish. Leaves deciduous or marcescent, mostly basal, alternate, ternate [or simple]; stipules persistent, basally adnate to petiole, sheathing, lanceolate to ovate, margins entire; petiole present; blade bluntly ovate to obovate [or cordate] in outline, 1–3 [–4] cm, foliaceous, leaflets 3, cuneate or oblanceolate to broadly elliptic or obovate to nearly orbiculate, margins flat, shallowly (2–) 3 (–5) [–7] -toothed apically, central tooth usually shorter than others, venation pinnate, surfaces often more densely strigose on veins and margins, sometimes glabrous. Inflorescences terminal, (1–) 3–12-flowered, loosely capitate or corymbose (or flowers solitary); bracts present, reduced; bracteoles absent. Pedicels present, straight or curved. Flowers 4–7 [–10] mm diam.; epicalyx bractlets 5; hypanthium shallowly cupulate, 0.5–2 × 2–4 [–5] mm, usually strigose, sometimes glabrous; sepals 5, spreading, broadly lanceolate to ovate; petals 5, ± yellow, oblanceolate [to obovate], shorter [to slightly longer] than sepals; stamens 5 [rarely 10], shorter than petals, filaments columnar, glabrous, anthers with theca solitary, ± horseshoe-shaped, rimming an indistinct connective, dehiscing by continuous marginal slit; torus hemispheric; carpels 5–15 [–30], glabrous, styles lateral, narrowly clavate; ovule 1. Fruits aggregated achenes, individually deciduous, 5–15 [–30], obliquely ovoid, 1.2–1.7 mm, glabrous; hypanthium persistent; sepals persistent, erect; styles tardily deciduous, jointed. x = 7.

Distribution

North America, c Mexico, Eurasia

Discussion

Species 6 (1 in the flora).

When not included within Potentilla, Sibbaldia has been circumscribed to include 20 or more species, centered in the Himalayas (B. K. Dikshit and G. Panigrahi 1981; Li C. L. et al. 2003). This broad circumscription is not supported by molecular analyses (T. Eriksson et al. 1998, 2003; M. Lundberg et al. 2009; C. Dobeš and J. Paule 2010), in which S. procumbens (lectotype of the genus), S. cuneata Hornemann ex Kunze, S. parviflora Willdenow, and S. semiglabra C. A. Meyer form a clade in the Fragariinae; most other species nest within Potentilla. These molecular results coincide with morphological features emphasized by J. Soják (1985[1989], 2008), that is, each anther bearing a single horseshoe-shaped theca versus more typical paired thecae, and lateral versus subterminal attachment of narrowly clavate styles.

This citation of six species in Sibbaldia follows J. Soják (2008, pers. comm.), largely coinciding with sect. Eusibbaldia by O. A. Muravjeva (1936). Included are the four species mentioned above plus S. aphanopetala Handel-Mazzetti and S. trullifolia (Hooker f.) Chatterjee. The last is an enigmatic, simple-leaved species that is known only from the type; it has not been included in molecular analyses. More recently, Soják (2012) has proposed treating S. aphanopetala, S. parviflora, and S. semiglabra as subspecies of S. procumbens, but without validly publishing the corresponding combinations. The three species of Sibbaldiopsis have also been included in Sibbaldia (J. Paule and Soják 2009; Soják 2012), but too late for full incorporation in the current treatment. All other species traditionally placed in Sibbaldia are relegated to Argentina Hill, Piletophyllum (Soják) Soják, Potentilla in the strict sense, or Sibbaldianthe Juzepczuk.

Selected References

None.

"thin" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Sibbaldia"
horseshoe--shaped +
Barbara Ertter +  and James L. Reveal +
Linnaeus +
compound +  and simple +
opposite +  and alternate +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
bluntly ovate +  and obovate +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
coriaceous +
reduced +
free +  and distinct +
North America +, c Mexico +  and Eurasia +
not +  and aggregated +
For Robert Sibbald, 1642–1722, professor of medicine at Edinburgh +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glabrous +  and strigose +
(1-)3-12-flowered +
crassinucellate +
marcescent +
deciduous +
oblanceolate +  and broadly elliptic or obovate +
(2-)3(-5)[-7]-toothed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
curved +  and straight +
0 (?) +  and 4 (?) +
free +  and distinct +
oblanceolate +
adnate +, free +, connate +  and distinct +
Sp. Pl. +  and Gen. Pl. ed. +
1753 +  and 1754 +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
broadly lanceolate +  and ovate +
free +  and distinct +
branched +  and simple +
green +  and reddish +
prostrate +  and ascending +
1 +  and 10 +
palmate +  and pinnate +
lanceolate;ovate +
deciduous +
distinct +
clavate +
glabrous +  and strigose +
Potentilla sect. Sibbaldia +  and Potentilla subg. Sibbaldia +
Sibbaldia +
Rosaceae tribe Potentilleae +
inconspicuous +
hemispheric +
enlarged +
sparsely strigose +  and subappressed pilose +