Characters;"P. rhombifolium";"P. rosettifolia" "Leaf blade" "Shape and size";"ovate or ovate to rhombic, 1.5–5.3 × 1.3–2.8 cm";"broadly ovate to orbicular or broadly elliptic, 0.5–4.0 × 0.4–3.0cm" Margin;"nearly entire or slightly repand";"entire to crenulate-serrulate toward apex" "lateral veins";"conspicuous, 2–3 pairs";inconspicuous Base;"rounded or cuneate";"broadly cuneate to cuneate" Apex;"acute or obtuse";"broadly acute" indumentum;"densely white pubescent to siliceous";"densely appressed puberulent or sericeous to tomentose" Petiole;"to 15 cm long";"to 4 cm long" Cymes;1-flowered;1-flowered Corolla Calyx;"actinomorphic, equally divided into 5 lobes from base";"actinomorphic, equally divided into 5 lobes from base" "colour and indumentum";"light blue, upper lip white, outside sparsely pubescent to puberulous, inside sparsely puberulent or subglabrous";"purple-blue throughout, outside sparsely puberulent, inside glabrous" "adaxial lip";"14–15 × 9–10 mm, distinctly 2-lobed with the two lobes reflexed";"ca. 5 mm, distinctly 2-lobed" "abaxial lip";"27–28 × 12–14 mm";"ca. 8 × 7 mm" Throat;"whitish light blue or somewhat light blue with 2 oblong deep blue blotches";white Tube;"5–6 mm";"ca. 5 mm" Stamens filaments;"ca. 3 mm, sparsely pubescent";"ca. 3 mm, minutely hispid" anthers;"ca. 3 mm";"ca. 1 mm, beakless" Pistil;"ca. 1.1 cm";"ca. 1 cm" Ovary;"oblate, densely villous";"elliptic-ovoid, appressed puberulent" Style;"ca. 8 mm, sparsely pubescent near base";"5–7 mm, sparsely puberulent near base" "Flowering time";"March to May";October