▁two ▁other ▁species ▁that ▁have ▁ster ile ▁disc ▁flor ets , ▁E . ▁ber ger iana ▁( now ▁Fel icia ▁ber ger iana ) ▁and ▁E . ▁c ili ata ▁( now ▁Z yr ph el is ▁tax ifolia ), ▁Ne es ▁von ▁Es en beck ▁in ▁the ▁following ▁year ▁retained ▁Poly arr h ena , ▁but ▁August in ▁Py ram us ▁de ▁Cand ol le ▁included ▁P . ▁ref lex a ▁in ▁Fel icia ▁in ▁ 1 8 3 5 , ▁while ▁Irish ▁botan ist ▁William ▁Henry ▁Har vey ▁in ▁ 1 8 6 5 ▁re en list ed ▁the ▁species ▁under ▁A ster . ▁J ür ke ▁Gra u ▁in ▁his ▁review ▁of ▁the ▁genus ▁extended ▁Poly arr h ena ▁by ▁re assign ing ▁Fel icia ▁im br ic ata , ▁and ▁describing ▁two ▁new ▁species , ▁Poly arr h ena ▁pro str ata ▁and ▁P . ▁strict a , ▁and ▁two ▁new ▁sub species , ▁P . ▁ref lex a ▁sub sp . ▁bra chy ph yl la ▁and ▁P . ▁pro str ata ▁sub sp . ▁dent ata . ▁ ▁Description ▁ ▁The ▁species ▁belonging ▁to ▁the ▁genus ▁Poly arr h ena ▁are ▁shr ub lets , ▁cre eping ▁with ▁up ▁to ▁ ▁long ▁branches ▁in ▁P . ▁pro str atum , ▁or ▁with ▁asc ending ▁to ▁ere ct ▁st ems ▁of ▁between ▁ ▁in ▁P . ▁im br ic ata , ▁ ▁in ▁P . ▁strict a , ▁ ▁in ▁P . ▁ref lex a . ▁Three ▁types