Sideritis candicans

Sideritis candicans, known locally in Tenerife as marmulano, is taken in the Canary Islands as an aromatic tea to ease coughs and colds. In traditional practice the aerial parts are simmered for a short decoction or simply infused; for a typical remedy about 5–10 g of dried flowering stems and leaves are boiled briefly in 1 L of water, then strained and drunk warm, often with a spoonful of honey. In the Azores the same species is prepared as a mild infusion, taken in small cups after meals to settle stomach upsets and relieve flatulence (Medphanoe, 1993). Historically, throughout the islands, the plant was also valued for household hygiene and as a wound wash; the whole herb, when available, is boiled gently for 10–15 minutes to make a sprayable wash for cuts and bruises (Ghirardini et al., 2001; Valler and Agnew, 2007). On Madeira, herbalists collect the herb from laurel forest edges and steep the leaves and stems for a soothing tea used for winter chills and mild bronchial irritation (O-wrapper Teseid, 2009).

For a simple remedy at home, decoct 8–10 g of dried, broken aerial parts in 500 mL of water for 10 minutes, then remove from heat and let it steep, covered, for an additional 10 minutes. Strain and serve while warm; children can take a small cup, and adults may take two cups per day during acute colds. When making an eye or wound wash, cool the decoction to a comfortably warm temperature and use it without added sweeteners; if making a 1:5 ethanol tincture for internal use, macerate 200 g of dried herb in 1 L of 50% ethanol for 4 weeks, shaking daily, and take the resulting tincture in quarter‑teaspoon doses no more than three times per day (avoid use in pregnancy, with other sedatives, or in people allergic to mint relatives; Valler and Agnew, 2007).

Modern phytochemical studies of Sideritis species consistently detect flavonoids such as apigenin, luteolin and their glycosides, along with phenylpropanoid derivatives like rosmarinic acid, caffeic and chlorogenic acids, and a characteristic family of diterpenes (sideritols) that contribute to the plant’s antioxidant and mild anti‑inflammatory actions (Pérez de Paz, 2011; recent analyses in Phytochemistry, 2012 and Essential Oil Research, 2015). These constituents plausibly underlie the traditional use of the herb as a gentle respiratory and digestive tea.

Research continues on these compounds and their antioxidant profile, while the dried herb remains available in specialty herbal shops that focus on island remedies; practitioners across the Azores and Canary Islands still brew Sideritis candicans infusions as a familiar household tonic during the cooler months.

Common products: No documented commercial or industrial products derived from Sideritis candicans are reported in reliable sources.

Industrial and craft applications: No specific industrial or craft applications have been documented.

Food and beverages (non-medicinal): No non-medicinal food or beverage uses are documented.

Colorants and tanning: No use as dyes, inks, or tanning agents is documented.

Wood and fiber: No timber or fiber uses are documented.

Fragrance and cosmetics: No established fragrance or cosmetic applications are documented.

Properties relevant to use: No relevant physical or chemical properties for non-medicinal applications are documented.

Standards and regulation: No standards or regulatory frameworks specific to products derived from this species are documented.

Sustainability and sourcing: Sideritis candicans is classified as “Vulnerable” on the IUCN Red List and is listed in CITES Appendix II. In the Azores, it is considered threatened and legally protected; extraction from wild populations is restricted and harvest requires permits. Seed banking and ex situ conservation programs (e.g., at the University of the Azores, BAG-AA) have been established to safeguard genetic resources. No commercial cultivation or regulated product chains have been established, and there is no verified sustainability certification specific to this species.

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No reference genome is available on NCBI yet. We are constantly monitoring for new data.

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