G2 - Imperiled globally because of rarity (6 - 20 occurrences, or few remaining acres, or miles of stream) or very vulnerable to extinction throughout its range because of other factors.G1 - Critically imperiled globally because of extreme rarity (5 or fewer occurrences), or very few remaining acres, or miles of stream) or especially vulnerable to extinction because of some factor of its biology.The global rank reflects the species worldwide rarity. (Definitions from: American Heritage Science Dictionary)Д®ach species' global rank is determined by NatureServe. The association between the different organisms in a lichen is so close that lichens are routinely referred to as a single organism, and scientists classify lichens using the name of the fungal component. The more familiar lichens grow slowly as crusty patches, but lichens are found in a variety of forms, such as the tall, plantlike reindeer moss. Owing to this partnership, lichens can thrive in harsh environments such as mountaintops and polar regions. These live protected among the dense fungal hyphae and produce carbohydrates for the fungus by photosynthesis. The fungal component of a lichen absorbs water and nutrients from the surroundings and provides a suitable environment for the alga or cyanobacterium. The mutualistic symbiotic association of a fungus with an alga or a cyanobacterium, or both. In contrast to the vascular plants, the gametophyte (haploid) generation of bryophytes constitutes the larger plant form, while the small sporophyte (diploid) generation grows on or within the gametophyte and depends upon it for nutrition. Bryophytes generally live on land but are mostly found in moist environments, for they have free-swimming sperm that require water for transport. Bryophytes lack the specialized tissues xylem and phloem that circulate water and dissolved nutrients in the vascular plants. Also called tracheophyte.ДЄ large group of seedless green plants including the mosses, liverworts, and hornworts. The vascular plants include all seed-bearing plants (the gymnosperms and angiosperms) and the pteridophytes (including the ferns, lycophytes, and horsetails). 1838.ДЄny of various plants that have the vascular tissues xylem and phloem. Helosciadium ranunculifolium de Candolle, Prodr. 1824.Д«ASIONYM: Pimpinella lateriflora Link 1821. Helosciadium laciniatum de Candolle, var. 1899, non Kunth 1821.Д«ASIONYM: Helosciadium ranunculifolium de Candolle 1830.ДЄpium rivulare Larranaga, Escritos 2: 116. elatius Hooker & Arnott 1833.ДЄpium ranunculifolium (de Candolle) Reiche, Anales Univ. 1927.Д«ASIONYM: Helosciadium laciniatum de Candolle, var. (holotype: POM).ДЄpium laciniatum (de Candolle) Urban, forma elatius (Hooker & Arnott) H. TYPE: MEXICO: Zacatecas: Lake near San Miguel Zacatecas, s.d., Jones s.n. 1898.ДЄpium ammi (Savi) Urban, forma pedunculata Chodat, Bull. filamentosum Kuntze 1898.ДЄpium ammi (Savi) Urban, forma nanum Kuntze, Revis. 1927.Д«ASIONYM: Apium ammi (Savi) Urban, var.

1804.ДЄpium ammi (Savi) Urban, forma filamentosum (Kuntze) H. Helosciadium leptophyllum (Persoon) de Candolle, MГ©m. inadmiss.Д«ASIONYM: Apium ammi (Savi) Urban 1879, non Crantz 1767 Seseli ammi Savi 1804.ДЄpium ammi (Savi) Urban, var.

1879, non Crantz 1767.ДЄpium ammi (Savi) Urban, var. 1813.Д«ASIONYM: Pimpinella leptophylla Persoon 1805.ДЄpium ammi (Savi) Urban, in Martius, Fl. Aethusa leptophylla (Persoon) Sprengel, Pl.

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