Flora of North America species comparison

erect, 10–30 cm, glabrous or puberulent.

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, glabrous, rarely puberulent proximally, especially along margins;

basal and proximal cauline sessile, 15–20(–40) × 0.5–1.5 mm, blade linear, base tapered to ± clasping, margins entire, apex acute;

cauline 3–7 pairs, sessile, 11–35 × 0.3–1 mm, blade linear, base tapered to ± clasping, margins entire, apex 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 or interrupted, cylindric, 3–15 cm, axis glabrous or retrorsely hairy, verticillasters 3–7, cymes 1- or 2(or 3)-flowered, 1 or 2 per node;

proximal bracts linear, 10–30 × 0.3–1 mm;

peduncles and pedicels glabrous, rarely puberulent.

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 ovate, 3.5–5.8 × 1.3–2.2 mm, glabrous;

corolla white or pink to violet or purple, without nectar guides, tubular-funnelform, 9–18 mm, glabrous externally, moderately yellow-villous internally abaxially, tube 4–5 mm, throat gradually inflated, not constricted, 5–6 mm diam., rounded abaxially;

stamens included, pollen sacs opposite, navicular, 1–1.5 mm, dehiscing completely, sutures papillate;

staminode 7–11 mm, included or reaching orifice, 0.5–0.7 mm diam., tip straight to recurved, distal 3–5 mm pilose, hairs yellow or yellow-orange, to 1 mm;

style 9–12 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).

4–5 × 2.5–4 mm.

glabrous, rarely glandular-pubescent distally.

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