us ▁or ▁Thanks g iving ▁c act us . ▁ ▁Description ▁Schl umber ger a ▁russ elli ana ▁res emb les ▁other ▁species ▁of ▁the ▁genus ▁Schl umber ger a ▁in ▁that ▁it ▁has ▁le a fl ess ▁green ▁st ems ▁which ▁act ▁as ▁photos yn th etic ▁org ans . ▁The ▁st ems ▁ ▁( cl ad odes ) ▁are ▁composed ▁of ▁strongly ▁fl atten ed ▁segments , ▁which ▁have ▁a ▁small ▁number ▁of ▁not ches ▁along ▁their ▁edges . ▁Ind ividual ▁segments ▁are ▁about ▁ ▁long ▁by ▁ ▁wide . ▁ ▁Special ▁structures ▁characteristic ▁of ▁c act i , ▁called ▁" are oles ", ▁occur ▁in ▁the ▁not ches ▁at ▁the ▁side ▁of ▁a ▁segment ▁and ▁at ▁the ▁end . ▁The ▁are oles , ▁which ▁br ist les ▁up ▁to ▁ ▁long , ▁are ▁where ▁the ▁flower ▁bud s ▁appear . ▁The ▁flowers ▁hang ▁down wards ▁and ▁are ▁radial ly ▁symmet rical ▁( regular ). ▁They ▁are ▁about ▁ ▁long ▁by ▁ ▁across . ▁The ▁te p als , ▁which ▁are ▁of ▁various ▁sh ades ▁of ▁p ink , ▁are ▁arranged ▁in ▁two ▁groups , ▁giving ▁the ▁appearance ▁of ▁a ▁" flow er ▁within ▁a ▁flower ". ▁The ▁inner ▁te p als ▁are ▁longer ▁and ▁f used ▁together ▁at ▁the ▁base ▁to ▁form ▁a ▁fl oral ▁t ube ▁about ▁ ▁long ; ▁ne ct ar ▁is ▁produced ▁at ▁the ▁base ▁of ▁this ▁t ube . ▁Pl ants ▁flower ▁in ▁the ▁spring ; ▁when ▁cultiv ated ▁in ▁the ▁Northern ▁Hem is phere