Hypericum gentianoides is a species of flowering plant in the St. John's wort family Hypericaceae. Its common names include orangegrass and pineweed.
| Hypericum gentianoides | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Malpighiales |
| Family: | Hypericaceae |
| Genus: | Hypericum |
| Section: | H. sect. Brathys |
| Species: | H. gentianoides
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| Binomial name | |
| Hypericum gentianoides | |
| Synonyms | |
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Sarothra gentianoides L. | |
Native to eastern North America, it ranges from Ontario; Nova Scotia and Maine south to Florida, west to Texas, and north to Missouri and Minnesota.[1][2]
It is an annual herb typically growing 10–40 cm tall. The leaves are repressed against the stem, 1-3mm long, and scale-like; an adaptation to reduce transpiration in exposed environments.[3] The flowers are no more than 3mm across, with five to ten stamens, and three styles.[4][5] It commonly grows in nutrient poor soil, sand, and on exposed sites, but is also known to occur in wetter areas such as coastal plain marshes.[5] The name orangegrass refers to the citrus smell that is released when it is crushed.[6] Chemical extracts of H. gentianoides have been found to inhibit the contraction of HIV.[7]
References
edit- ^ "Lady Bird Johnson Wildflower Center - the University of Texas at Austin". wildflower.org. Retrieved 2023-12-29.
- ^ "BONAP's Map".
- ^ Thoday, D. (1931). "The Significance of Reduction in the Size of Leaves". Journal of Ecology. 19 (2): 297–303. Bibcode:1931JEcol..19..297T. doi:10.2307/2255823. JSTOR 2255823.
- ^ "US Wildflower - Pineweed, Orangegrass - Hypericum gentianoides". USWildflowers.com. Retrieved November 21, 2022.
- ^ a b "Hypericum gentianoides (L.) B.S.P." (PDF). Michigan Natural Features Inventory. Retrieved November 21, 2022.
- ^ "Hypericum gentianoides (Orange-grass St. John's-wort): Go Botany".
- ^ Hillwig, Matthew (January 2008). "DSpace Angular Universal".
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