▁and ▁ ▁wide ▁on ▁a ▁re dd ish ▁flow ering ▁stem ▁ ▁tall ▁with ▁three ▁to ▁five ▁stem ▁leaves ▁with ▁their ▁bases ▁wrapped ▁around ▁the ▁stem . ▁The ▁stem ▁leaves ▁are ▁linear ▁to ▁lance - sh aped , ▁ ▁long ▁and ▁ ▁wide . ▁The ▁d ors al ▁se pal ▁and ▁pet als ▁are ▁f used , ▁forming ▁a ▁h ood ▁or ▁" g ale a " ▁over ▁the ▁column . ▁The ▁d ors al ▁se pal ▁is ▁ ▁long , ▁ ▁wide ▁and ▁has ▁a ▁rough ▁surface . ▁It ▁is ▁ere ct ▁near ▁its ▁base , ▁then ▁curves ▁forward ▁with ▁the ▁d ors al ▁se pal ▁longer ▁than ▁the ▁pet als . ▁The ▁later al ▁sep als ▁are ▁more ▁or ▁less ▁ere ct ▁with ▁narrow ▁tips ▁ ▁long ▁with ▁a ▁deep ▁not ch ▁in ▁the ▁sin us ▁between ▁them ▁and ▁a ▁wide ▁gap ▁between ▁them ▁and ▁the ▁g ale a . ▁The ▁lab ell um ▁is ▁ ▁long ▁and ▁about ▁ ▁wide , ▁cur ved , ▁re dd ish - b rown ▁and ▁pro tr udes ▁above ▁the ▁sin us . ▁Flow ering ▁occurs ▁between ▁October ▁and ▁January . ▁ ▁Tax onomy ▁and ▁naming ▁P ter ost yl is ▁ir w ini i ▁was ▁first ▁formally ▁described ▁in ▁ 1 9 9 7 ▁by ▁David ▁Jones , ▁Brian ▁Mol loy ▁and ▁Mark ▁Clement s ▁and ▁the ▁description ▁was ▁published ▁in ▁The ▁Or ch ad ian . ▁The ▁specific ▁ep ith et ▁( ir w ini i ) ▁hon ours ▁J . ▁Bruce