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The gymnosperms (/ ˈ dʒ ɪ m n ə ˌ s p ɜːr m z,-n oʊ-/ ⓘ nə-spurmz, -noh-; lit. ' revealed seeds ') are a group of woody, perennial seed-producing plants, typically lacking the protective outer covering which surrounds the seeds in flowering plants, that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae [2] The term gymnosperm comes from the ...
The extant spermatophytes form five divisions, the first four of which are classified as gymnosperms, plants that have unenclosed, "naked seeds": [1]: 172 Cycadophyta, the cycads, a subtropical and tropical group of plants, Ginkgophyta, which includes a single living species of tree in the genus Ginkgo,
Seeds are the source of some medicines including castor oil, tea tree oil and the quack cancer drug Laetrile. Many seeds have been used as beads in necklaces and rosaries including Job's tears, Chinaberry, rosary pea, and castor bean. However, the latter three are also poisonous. Other seed uses include: Seeds once used as weights for balances.
A type of naked oat called pillas, pilez, or pil-corn in the Cornish language and dialect of English [6] may have been the same species as Avena nuda. John Ray calls it Avena minuta. [7] Well known in the 17th century it was commonly grown in Cornwall as late as the 18th and 19th centuries. [8] The last known crop was harvested at Sancreed in ...
[5] [6] Another defence mechanism against herbivores is the accumulation of toxins in seeds and vegetative tissues; through horizontal gene transfer, cycads have acquired a family of genes from a microbial organism, most likely a fungus, which gives them the ability to produce an insecticidal toxin. [7]
A fruit is the mature, ripened ovary of a flower following double fertilization in an angiosperm.Because gymnosperms do not have an ovary but reproduce through fertilization of unprotected ovules, they produce naked seeds that do not have a surrounding fruit, this meaning that juniper and yew "berries" are not fruits, but modified cones.
The FDA determined that the data presented in a 2022 color additive petition show that this ingredient causes cancer in male laboratory rats exposed to high levels of FD&C Red No. 3 because of a ...
Lycoris squamigera is an herbaceous plant with abundant and long (up to 12" long and 1" wide) leaves ("clothes") that appear in spring. The leaves are no longer present when the flowers emerge much later, without their "clothes", from the bare ground, hence the name "Naked Ladies".