Rincon Mountain District, Saguaro National Park Vegetation Inventory, Mapping,andCharacterization Report,Saguaro National Park constricta -Larreatridentata)/AmbrosiadeltoideaWooded ShrublandAssociation(P) well-drained fine-loamy soil underlying a layer coarse (5–10cm)gravel. of transition with low hills and/or pediment formations. In general, the surface cover isdefined by deep andvery system. It isfound exclusively on low-angle (1–6%)alluvial fans around 850meters (2,788ft),usually near the theof Rincon Mountain District and scattered throughout the Cactus Forest LoopRoad and associated trail This restricted community iscontained within athree-association map class that covers 3.6% (983ha/2,429 ac) ranging from 10%to 20%,with anaverage around 15%. terized by the overwhelming dominance triangle of bur ragweed (A. deltoidea). This species provides cover ( 8% acrossof the community, including some areas upto 15%.Creosote (L. tridentata)and whitethorn acacia dominance throughout. Onaverage, cactus apple (O. engelmannii ) provides the highest cover, with anaverage creosote (L. tridentata),and whitethorn acacia (V. constricta) providing the most consistent presence (1.0)and The subcanopy ischaracterized by adiverse shrubs mixof and succulents, with cactus apple (O. engelmannii), yellow paloverde (P. microphylla), with average cover around of 2–3%. also aconsistent (1.0)associate that canoccasionally co-dominate with with average cover around of 4%.Velvet mesquite (Prosopis velutina ) is cally present asscattered medium-sized (3–4m),tree-like individuals Yellow paloverde (P. microphylla) isaconsistent (1.0)dominant, typi- 15–25% cover, dominated by triangle burragweed (Ambrosia deltoidea ). stricta), and creosote (Larrea tridentata),with afield stratum (<0.5m) of cactus apple (Opuntiaengelmannii),whitethorn acaciaVachellia ( con- phylla) and avariable (10–25%cover) subcanopy stratum (0.5–2m)of cover) canopy stratum yellow (2–5m)of paloverde (Parkinsonia micro- This wooded shrubland community ischaracterized by asparse (<10% Wooded ShrublandAssociation(P) (Saguaro) /Yellow paloverde/Cactusapple(Whitethornacacia-Creosote) /Triangle burragweed 7. (Carnegieagigantea)/Parkinsoniamicrophylla V. constricta) provide variable cover ranging from ascant 1%upto adominant 5%. The field layer is charac Opuntiaengelmannii( • • • • • • Common species
Ambrosia deltoidea Vachellia constricta Larrea tridentata Opuntia engelmannii Prosopis velutina Parkinsonia microphylla Vachellia - Rincon Mountain District, Saguaro National Park