Tucson Mountain District, National Park Vegetation Inventory, Mapping,andCharacterization Report,Saguaro National Park This association isone five of found inboth the TMD and the Rincon Mountain District. composed afine-grained of metaquartzite with occasional areas rhyoliticof tuff. and clay underlying alayer coarse (5–10cm)gravel of with scattered rocks. Typically, the rock and gravel are meters (2,609–3,100ft).In general, the surface cover ischaracterized by shallow, well-drained skeletal loam portions the of district. It isfound on small, low-angle (<25%),rolling variable hills of aspects from 820to 945 This community covers the 5%(493ha/1,218 ac)of TMD. It isspread throughout the northern and eastern this association, this species provides cover typically of lessthan 10%. (<0.5 m)isconsistently dominated (1.0)by the low subshrub, triangle burragweed ( landier’s wolfberry (Lycium berlandieri), and buckhorn cholla (Cylindropuntia acanthocarpa). The field layer District (TMD), the subcanopy isasparse (2–4%cover) whitethorn mixof acacia (Vachellia constricta), Ber Rincon Mountain District (RMD),this species provides cover around of 5[10]%. At the Tucson Mountain composition isconspicuously different between the two districts. At the -like individuals with average cover around of 3%. The subcanopy ( nated by triangle burragweed (). Yellow paloverde moderately dense (20–40%cover) field layer (<0.5m)solely domi- canopy yellow (2–5m)of paloverde ( microphylla ) and a This shrubland community ischaracterized by avery sparse (<5%cover) Yellow paloverde/Triangle burragweedShrublandAssociation(P) 26. P. microphylla) isconsistently (1.0)present asscattered, small (3–4m), / AmbrosiadeltoideaShrublandAssociation(P) • • Common species

Ambrosia deltoidea Parkinsonia microphylla A. deltoidea). Throughout - Tucson Mountain District, Saguaro National Park Rincon Mountain District, Saguaro National Park Vegetation Inventory, Mapping,andCharacterization Report,Saguaro National Park This association isone five of found inboth the RMDand the Tucson Mountain District. and gravel are composed afine-grained of metaquartzite with occasional areas rhyoliticof tuff. skeletal loam and clay underlying alayer coarse (5–10cm)gravel of with scattered rocks. Typically, the rock from 820to 945meters (2,609–3,100ft).In general, the surface cover ischaracterized by shallow, well-drained theend of Cactus Forest LoopRoad. It isfound on small, low-angle (<25%),rolling variable hills of aspects This community covers the 0.01%(3.5ha/6.5 ac)of RMD, where it islimited to one hill toward the northern deltoidea). Throughout this association, this species typically provides <10%cover. cover. The field layer (<0.5m)is consistently dominated (1.0) by the low subshrub, triangle bur (A. creosoteof (Larrea tridentata),with noother noteworthy associates. This species provides around 5[10]% the Rincon Mountain District (RMD),the subcanopy ischaracterized by the presence and typical dominance m) composition isconspicuously different between the two districts. At like individuals with average cover around of 3%. The subcanopy (0.5–2 crophylla) isconsistently (1.0)present asscattered, small (3–4m),tree- by triangle burragweed (Ambrosia deltoidea). Yellow paloverde mi (P. moderately dense (20–40%cover) field layer (<0.5m)solely dominated canopy yellow (2–5m)of paloverde (Parkinsonia microphylla ) and a This shrubland community ischaracterized by avery sparse (<5%cover) Yellow paloverde/Triangle burragweedShrublandAssociation(P) 26. Parkinsonia microphylla/ AmbrosiadeltoideaShrublandAssociation(P) - • • Common species

Ambrosia deltoidea Parkinsonia microphylla Rincon Mountain District, Saguaro National Park