Page 33 - 《广西植物》2020年第10期
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1 4 1 6                                广  西  植  物                                         40 卷

                            Key to the species of Petrocosmea in Vietnam

   1. Adaxial corolla lip 2 ̄parted near base or at least in apical 1/ 3.
     2. Filament glabrous   1. P. condorensis
     2. Filament puberulent   2. P. duclouxii
   1. Adaxial corolla lip indistinctly 2 ̄lobedꎬ emarginateꎬ or undivided
     3. Leaf blade base cordate or roundedꎻ calyx segments narrowly lanceolateꎻ style glabrous   3. P. martinii
     3. Leaf blade base cuneateꎬ broadly cuneateꎬ rarely roundedꎻ calyx segments linear or narrowly triangularꎻ style
       puberulent near base.
       4. Peduncleꎬ outer calyx surfaceꎬ petioleꎬ and leaf blade densely short appressed puberulentꎻ pedicel 0.4-1.2
         cm longꎻ capsule to 12 mm long   4. P. sericea
       4. Peduncleꎬ outer calyx surfaceꎬ petioleꎬ and leaf blade densely long shaggy pubescentꎻ pedicel 1.4-2.5 cm
         longꎻ capsule 5-8(10) mm long   5. P. minor


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