Of the Blue Nivalids, this perhaps one of the easiest species to write about. That is because it is little known, probably only collected once ever, by Sherriff and Taylor (PDF) , on the Mira La, Tibet in 1938. A search of the Chinese Virtual Herbarium turns up no Chinese collections and that could be because to get to the Mira La is a two day hike and suitable elevation isn't accessible via road in that area. Above is the holotype from the British Museum (specimen BM00099651).
|Mira La, Tibet (Namcha Barwa Peak in the right background)|
|Primula littledalei (under boulder to right) habitat similar to P. youngeriana|
|Primula littledalei, Mi La, Tibet|
Sherriff thought that P. youngeriana was an unusual form of Primula macrophylla var. macrocarpa (now P. megalocarpa) but with flaccid leaves and copious white farina, not something new. What makes P. youngeriana so distinctive is that the bracts are long, linear and acute at the tip and the calyx is large (1-1.5cm) and cut to the base into lanceolate, patent (spreading) lobes which are acute and densely farinose inside. P. megalocarpa also has calyces which are cut to the base but that species differs in other characteristics.
|A portion of E00024585|
courtesy of the Royal Botanic Garden Edinburgh