To screen the differentially accumulated metabolites in C. deserticola fleshy stems and H. ammodendron roots (CF-vs.-HcF, HcF-vs.-HF, CS-vs.-HcS and HcS-vs.-HS), an orthogonal partial least squares discrimination analysis (OPLS-DA) was performed (Figure S2A–D). Here, HCFC1 is linked to hydrops fetalis.