Flora of North America species comparison

retrorsely hairy, rarely glabrous, not glaucous.

ascending to erect, 10–35 cm, glabrous or sparsely retrorsely hairy, hairs white, scalelike.

cauline, rarely basal and cauline (P. retrorsus), opposite, leathery or not, glabrous, glabrate, pubescent, scabrous, puberulent, or retrorsely hairy, not glaucous;

basal and proximal cauline petiolate;

cauline petiolate or sessile, blade obovate, spatulate, oblanceolate, lanceolate, elliptic, or linear, margins entire.

leathery, glabrous, rarely sparsely retrorsely hairy, hairs white, scalelike abaxially, densely puberulent, hairs white, scalelike adaxially;

cauline 10–30 pairs, petiolate, 5–18 × 1–1.5 mm, blade oblanceolate to linear, base tapered, apex mucronate.

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

peduncles and pedicels spreading to ascending or erect.

continuous or interrupted, ± secund, 2–15 cm, axis glandular-pubescent, verticillasters 5–13, cymes 1–3-flowered, 1 per node;

proximal bracts oblanceolate to linear, 5–12 × 0.5–1 mm;

peduncles and pedicels ascending to erect, glandular-pubescent.

calyx tube 0.2–1 mm (1.5–2 mm in P. retrorsus), lobes: margins entire or erose, ± scarious or herbaceous, glandular-pubescent or retrorsely hairy, rarely glabrate;

corolla lavender, blue, violet, or purple, rarely scarlet, bilaterally symmetric, bilabiate, not personate, funnelform, tubular-funnelform, salverform, ventricose-ampliate, or ampliate, glandular-pubescent externally, hairy internally abaxially, rarely glabrous, throat slightly to abruptly inflated, not constricted at orifice, 2-ridged abaxially;

stamens included to exserted, filaments glabrous, rarely sparsely glandular-puberulent proximally, pollen sacs opposite, rarely divergent, navicular to subexplanate or explanate, dehiscing completely, connective splitting, sides glabrous, sutures papillate or smooth;

staminode included to exserted, ± flattened distally, 0.1–0.5 mm diam., tip straight to recurved, distal (20–)50–100% hairy, hairs to 0.7–1.3 mm;

style glabrous.

calyx lobes ovate to lanceolate, 2.5–3.5 × 1.2–1.8 mm, scarious-margined, glandular-pubescent, hairs pointed;

corolla lavender to violet or purple, lined internally abaxially with reddish purple nectar guides, tubular-funnelform, 9–14 mm, densely yellow- or whitish lanate internally abaxially, tube 3–5 mm, throat gradually inflated, 3.5–5 mm diam., slightly 2-ridged abaxially;

stamens included, filaments glabrous, pollen sacs opposite, navicular, 0.5–0.8 mm, sutures papillate;

staminode 7–8 mm, included or reaching orifice, flattened distally, 0.2–0.4 mm diam., tip straight to recurved, distal 5–6 mm densely pilose, hairs golden yellow, to 1 mm;

style 8–11 mm.

glabrous.

5–8 × 3–4.8 mm.

dark brown to black, angled to rounded, 1.1–2.1 mm.