Pau d'Arco (or Ipê) comprises a group of trees belonging to the genera Tabebuia and Tecoma.
Some of the species are traditionally used to treat a wide range of ailments, with a preference for the inner bark (1,2). Quinones derived from the bark of Tabebuia avellanedae have been shown to have anticancer and antibacterial properties (3,4). 

(1) Jones, K (1995) Pau d'Arco; Immune power from the rain forest. 152 p.

(2) Parrotta, JA (1995) Trees of the Tapajós; A photographic field guide. USDA Forest Service. 370 p.

(3) Lee JI, Choi DY, Chung HS, Seo HG, Woo HJ, Choi BT, Choi YH (2006) Beta-lapachone induces growth inhibition and apoptosis in bladder cancer cells by modulation of Bcl-2 family and activation of caspases. Exp Oncol. 28(1): 30-5

(4) Pereira EM, Machado Tde B, Leal IC, Jesus DM, Damaso CR, Pinto AV, Giambiagi-deMarval M, Kuster RM, Santos KR. (2006) Tabebuia avellanedae naphthoquinones: activity against methicillin-resistant staphylococcal strains, cytotoxic activity and in vivo dermal irritability analysis. Ann Clin Microbiol Antimicrob 5: 5

The common name "clove vine" is related to several scientific names, some of which are indicated to be synonyms, such as Tynanthus panurensis, T. elegans, and T. fasciculatus. Throughout South-America, clove vine is traditionally known for a wide range of medicinal applications (1,2). An extract of Tynanthus panurensis was found to contain compounds with anti-oxidant activity (2).

(1) Mors, WB, Rizzini, CT and Pereira, NA (2000) Medicinal Plants of Brazil. Reference Publications Inc: 501 p.

(2) Plaza A, Montoro P, Benavides A, Pizza C, Piacente S (2005) Phenylpropanoid glycosides from Tynanthus panurensis: characterization and LC-MS quantitative analysis. J Agric Food Chem 53(8): 2853-8