Eastern Mojave Vegetation Coll. No. 1911, Potentilla fissa  
 

 

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  Rosaceae Potentilla fissa
Photographed 1 December 2018.

Potentilla fissa Nutt. ex Torr. & A.Gray. (Syn: Drymocallis fissa (Nuttall) Rydberg) fide Ackerfield (2015).  Bigflower Cinquefoil.

Coll. No. 1911, 31 May 2018, characters observed: Perennial herb, rhizomatous, to 20 mm.; Stem, erect, green, multicellular viscid hairs; Leaves, basal and cauline, basal, 58 mm. × 16 mm. wide, compound, leaflets, #11, cauline, #3-4 per stem, alternate, compound, pinnate, stipules, 5 mm. × 2 mm. wide, lanceolate, entire to once shallowly toothed; petiole, 18 mm., multicellular viscid hairs, prior years remaining on plant (as sometimes described for P. rupincola), blade, 51 mm. × 22 mm. wide, leaflets, #13, petiolulate (not decurrent), 12 mm. × 9 mm. wide, viscid hairy, terminal leaflet (8)10 mm. side, margin, flat, serrate, teeth, 4-6 per side, on distal ¾, tip dark reddish; Inflorescence, clusters of 5+ flowers; Pedicels, 3 mm., hairy below; Calyx, lobes, #5, 7-7.5 mm. × 2.7-3.0 mm. wide, fused ±½, viscid hairy, epicalyx bractlets, 3-3.5 mm. × 0.8 mm. wide, ±½ sepals; Flowers, limb, 15 mm.; Petals, #5, 7-8 mm. × 5-9 mm. wide, obovate, yellow; Receptacle, hairy; Stamens, >25; Anthers, 1.4 mm. × 1 mm. wide; Ovary, many, superior, glabrous; Styles, 1.3 mm., attached laterally below top of ovary, thickest at base, tapered from middle, not warty; Stigma, #1; Achenes, glabrous.

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Date and time this page was prepared: 11/9/2019 7:46:20 PM