Fig. 4
Photos of dissected flowers of representative species of different clades. 1-3 (clade A, P. grandifolia): 1.longitudinal section, showing relative position of stamen and pistil inside corolla tube, 2. anthers, showing anthers constricted at top, poricidal with short filament, 3. pistil, showing style’s tip curving downward, Ca showing corolla throat ribbed at both upper and lower sides and relative position of style at throat magnified 1.7 times in size relative to Fig. 1-2. Scale bars = 2.7 mm (1), 1.4 mm (2) and 2.2 mm (3) (3.5 mm in Ca). 4-6 (clade B, P. mairei var. intraglabra): 4. longitudinal section, 5. Stamen, showing poricidal anther basifixed with straight filament (5’. anther of P. coerulea showing dehiscent pore), 6. Pistil, Cb showing corolla throat of P. coerulea ribbed at upper side and relative position of style at throat magnified 2.5 times in size relative to Fig. 1-8. Scale bars = 3.4 mm (4), 1.1 mm (5) (0.86 mm in 5’) and 1.3 mm (6) (2 mm in Cb). 7-9 (clade C, P. sericea): 7. longitudinal section, 8. Stamen, showing poricidal anther basifixed with long geniculate filament (8’. anther of P. minor showing dehiscent pore), 9. pistil, showing style curving downward at top, Cc showing corolla throat unribbed and relative position of style at throat magnified 2 times in size relative to Fig. 1-13. Scale bars = 2.9 mm (7), 1.8 mm (8) (1.6 mm in 8’) and 2.2 mm (9) (2.1 mm in Cc). 10-12 (clade D, P. forrestii and P. barbata): 10. longitudinal section of P. barbata, showing style extending from centre of the throat, 11. Stamen of P. forrestii, showing anther longitudinal dehiscent with short filament, 12. Pistil of P. forrestii, erect, Cd showing corolla throat of P. barbata unribbed and relative position of style at throat magnified 1.75 times in size relative to Fig. 1-17. Scale bars = 3.6 mm (10), 1.3 mm (11) and 1.9 mm (12) (2.6 mm in Cd). 13-15 (clade E, P. sinensis): 13. longitudinal section, 14. Stamen, showing longitudinal anther with short filament (14’. showing anther with longitudinal dehiscence becoming visible), 15. pistil, showing style curving downward at the base and curving upward at the top, Ce showing corolla throat unribbed and relative position of style at throat magnified 1.26 times in size relative to Fig. 1-24. Scale bars = 3.7 mm (13), 1.4 mm (14 and 14’) and 2.9 mm (15) (4.2 mm in Ce). CT, constriction; G, geniculate; L, lower lip; P. dehiscent pore; U, upper lip