Nice, but how do yoy know its gratrixianum? (vs, say, villosum?)
Key to species of paphiopedilum
p. gatrixianum :
Petal 2-4,4 cm wide, both sides of the midvein different in Color, apical half over twice broader than basal half
Penduncle covered with short hairs, dorsal sepal White, often tinged with pale green to pale yellow toward ist base, petal 2-2,5 cm wide, pouch often slightly auriculate on the both sides of ist mouth
p. villosum :
Petal covered with Long hairs, dorsal sepal pale green to pale yellow, with a deep maroon and deeper-striped central area, sometimes broadly White-margined , petal 2,5-4,5 cm wide, pouch conspicuously auriculate on both sides of ist mouth
the genus paphiopedilum in China , Liu Zhongjian , Chen Singchi
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Slipper Orchids of Vietnam , Leonid Averyanov , Phillip Cribb . Phan Ke Loc , Nguyen Tien Hiep
page 199 - 218
Photo 1 : gatrixianum ; Photo 2 : villosum