. ▁Navy ▁aircraft , ▁G j els vik ▁acquired ▁aer om agnet ic ▁profiles ▁over ▁the ▁Trans ant ar ctic ▁Mountains ▁border ing ▁the ▁Ross ▁Sea ▁and ▁Ross ▁Ice ▁Sh elf . ▁ ▁References ▁ ▁Category : R id ges ▁of ▁the ▁Ross ▁Dep endency ▁Category : H ill ary ▁Coast <0x0A> </s> ▁S art idia ▁is ▁a ▁genus ▁of ▁Southern ▁African ▁and ▁Mad agas can ▁plants ▁in ▁the ▁grass ▁family . ▁It ▁was ▁split ▁from ▁Arist ida ▁in ▁ 1 9 6 3 ▁by ▁South ▁African ▁botan ist ▁Bernard ▁de ▁Winter ▁and ▁contains ▁six ▁known ▁species , ▁of ▁which ▁S art idia ▁per rier i ▁is ▁considered ▁ext inct . ▁Their ▁natural ▁habit ats ▁are ▁warm , ▁semi - ar id ▁sav anna ▁and ▁dry ▁forest ▁at ▁alt itudes ▁of ▁ ▁where ▁ra inf all ▁ranges ▁from ▁ 2 5 0 ▁to ▁ 1 , 5 0 0   mm ▁per ▁year . ▁They ▁are ▁per enn ial ▁grass es ▁with ▁infl ores c ence ▁in ▁a ▁pan icle . ▁ ▁Other ▁than ▁most ▁species ▁in ▁sub family ▁Arist ido ide ae , ▁S art idia ▁species ▁use ▁the ▁ancest ral ▁C ▁photos yn th etic ▁path way . ▁Ph y log en etic ▁anal ys es ▁suggest ▁that ▁S art idia ▁is ▁the ▁sister ▁genus ▁of ▁St ip ag rost is , ▁an ▁important ▁C ▁genus ▁from ▁Africa ▁and ▁South west ▁Asia . ▁▁ ▁Species ▁ ▁S art idia ▁ang ol ensis ▁( C . E . Hub b .) ▁De