Flora of North America species comparison

prostrate, decumbent, ascending, or erect, 2–14(–20) cm, pubescent to densely retrorsely hairy.

retrorsely hairy, sometimes glandular-pubescent or glandular-villous distally or wholly, rarely glabrous, glabrate, or scabrous proximally or wholly, not glaucous.

basal and cauline, not leathery, retrorsely hairy;

basal and proximal cauline petiolate, (5–)10–40(–55) × 4–14 mm, blade spatulate to oblanceolate, base tapered, margins entire, apex obtuse to acute, rarely rounded;

cauline 1–3 pairs, sessile, 12–38 × 3–7 mm, blade oblanceolate, not arcuate, base tapered, margins entire, apex obtuse to acute.

basal and cauline, sometimes ± cauline or ± basal, opposite, rarely whorled (P. albidus, P. auriberbis, P. jamesii), leathery or not, glabrous or glabrate, scabrous, retrorsely hairy, glandular-pubescent, pubescent, villous, or glandular-villous, not glaucous;

basal and proximal cauline petiolate, sometimes sessile, rarely short-petiolate (P. pumilus);

cauline sessile or short-petiolate, blade ovate, deltate-ovate, oblanceolate, lanceolate, elliptic, oblong, or linear, rarely pandurate, margins entire or toothed.

continuous, cylindric, 0.5–8(–10) cm, axis retrorsely hairy, verticillasters 1–4(–7), cymes 1- or 2(–4)-flowered, 1 or 2 per node;

proximal bracts oblanceolate to lanceolate, 12–34 × 2–8 mm;

peduncles and pedicels retrorsely hairy, sometimes sparsely glandular-pubescent.

continuous or interrupted, cylindric, rarely ± secund to secund, axis glandular-pubescent, glandular-villous, or retrorsely hairy, rarely puberulent or glabrous, cymes 1 or 2 per node;

peduncles and pedicels ascending to erect.

calyx lobes lanceolate, 4–6 × 1–1.9 mm, retrorsely hairy, sometimes sparsely glandular-pubescent;

corolla light blue to blue or violet, with, rarely without, faint blue or reddish purple nectar guides, funnelform, 14–20 mm, glandular-pubescent externally, sparsely white-lanate internally abaxially, tube 6–7 mm, throat gradually inflated, not constricted at orifice, 4–7 mm diam., slightly 2-ridged abaxially;

stamens included or longer pair reaching orifice, pollen sacs opposite, navicular, 0.9–1.2 mm, dehiscing completely, sutures papillate;

staminode 7–10 mm, included or reaching orifice, 0.7–0.9 mm diam., tip recurved to coiled, distal 5–8 mm sparsely pubescent to lanate, hairs yellow or yellow-orange, to 1 mm;

style 10–12 mm.

calyx lobes: margins entire, sometimes erose (P. atwoodii, P. laricifolius, P. triflorus), herbaceous or ± scarious, glandular-pubescent or glandular-villous, sometimes also scabrous, rarely entirely retrorsely hairy, puberulent, or glabrous;

corolla white to lilac, lavender, blue, violet, purple, red, pink, or magenta, bilaterally symmetric, rarely nearly radially symmetric (P. goodrichii), weakly to strongly bilabiate, not personate, funnelform, tubular-funnelform, ventricose, or ampliate, glandular-pubescent externally, rarely glabrous (P. laricifolius), hairy internally abaxially, rarely glabrous or glandular-pubescent, throat gradually to abruptly inflated, rarely slightly inflated, constricted or not at orifice, rounded abaxially, sometimes slightly 2-ridged;

stamens included, reaching orifice, or longer pair exserted, filaments glabrous, pollen sacs parallel to divergent or opposite, navicular to subexplanate or explanate, rarely navicular-sigmoid, dehiscing completely, rarely incompletely, proximal 1/5–1/2 indehiscent, connective splitting, rarely not, sides glabrous, sutures smooth or papillate;

staminode included to exserted, flattened distally, 0.2–1.1 mm diam., tip straight to recurved or coiled, distal (40–)50–100% hairy, hairs to 4 mm;

style glabrous, sometimes proximally glandular-pubescent (P. eriantherus).

4–6 × 4–5 mm.

glabrous, rarely glandular-pubescent distally.

brown, dark brown, or black, angled to reniform or slightly rounded, 1.5–4.8 mm.