Alpine mouse-ear - Cerastium alpinum - Alpine chickweed - Músareyra - Fræhyrnur - Hjartagrasaætt - Caryophyllaceae - Pink Family - Steinhæðarplöntur - Villigróður - Garðagróður - Villijurtir - Hvít blóm - Íslensk tegund sem kemur fyrir á melum og í gisnum heiðargróðri. - It is native from Greenland, Iceland, Canada and northern Europe It is grown as a rock garden subject for its many small white flowers and silver haired stems and foliage. There are three subspecies.
Músareyra ber hvít hvít krónublöð sem eru klofin í endann. Krónublöðin eru þriðjungi til helmingi lengri en bikarblöðin og þannig þekkist jurtin frá vegarfa sem er annars nokkuð líkur. Blómin eru 1,5 til 2 sm í þvermál og í þeim eru 10 fræflar. Frævan er oftast með 5 stílum. Jurtin er öll hærð og á stilknum eru gagnstæð, stilklaus blöð. Músareyra vex í malarkenndum jarðvegi, mólendi og brekkum á Grænlandi, Kanada og norðurhluta Evrópu. Til eru þrjár undirtegundir af músareyra. Lesa meira: [ Ссылка ]
Fræhyrnur, Cerastium, er einsleit ættkvísl um 100 tegunda í hjartagrasaætt, Caryophyllaceae, með heimkynni um allan heim þó flestar vaxi um tempraðabeltið nyrðra. Þær þrífast almennt best á sólríkum stað í þurrum, snauðum jarðvegi. Lesa meira: [ Ссылка ]
Alpine mouse-ear that grows on serpentine cliffs in Kaavi is endangered and other serpentine variations in central Lapland are near threatened. Alpine mouse-ear is a very diverse plant which has three subspecies in Finland: ssp. alpinum, ssp. lanatum and ssp. glabratum. They differ from each other mainly in the amount of hair they have and their distribution. The species that are most different from each other, ssp. lanatum and ssp. glabratum, have at times been regarded as independent species. Most often subspecies appear on their own, but intermediate forms are quite common and in mixed stands the line between the different subspecies has to be drawn quite arbitrarily. The identification markers for ssp. alpinum are straight-haired stems, leaves and sepals. It grows mainly in the fell tundra belt in dryish meadows, shrubby heaths and steep Lappish banks, but it has also spread to the fell birch and coniferous forest belt, where it occasionally grows on rock walls. It is easy to cultivate and is sometimes found in garden rockeries. Its stem and leaves are densely packed with long, white hairs, which is a typical adaptation of plants that thrive in dry, sunny spots. It grows quite rarely in northern Lapland and Kuusamo on rocky ledges and scree beds, while a separate stand is known to exist on the southern side of the Baltic, near Tallinn in Estonia. Ssp. glabratum is almost hairless, and it rarely grows with other subspecies – presumably their ecological preferences are clearly different. It favours a chalky or magnesium-rich bedrock and grows mainly in the lower alpine tundra belt. It can also be found far from the fells, at least as far south as central Finland. Outwith its main habitat in the north the plants are almost without exception small-leaved and delicate, growing only on highly alkaline magnesium silicate (a.k.a. serpentine). See more: [ Ссылка ]
The species of Cerastium can be mistaken for those of the related genus Stellaria. Cerastium has petals cleft at most to 25 %, whereas Stellaria has petals split nearly to the base (or, in species not occurring in Svalbard, without petals). When in fruit, Cerastium has a fusiform to nearly cylindrical capsule opening by 10 or rarely 6 teeth (Cerastium cerastoides), whereas Stellaria has a subglobular to short cylindrical capsule opening by 6 teeth. Cerastium arcticum, C. alpinum, and C. regelii differ from C. cerastoides in several characters: by having five styles, a capsule with more or less skewed top opening by ten teeth, by the shoots not long and procumbent, with hairs on all sides and the leaves not upturned, and petals non-translucent white (“whole milk”). Cerastium cerastoides has three styles, a more or less straight capsule opening by 6 teeth, shoots are procumbent with hairs only on one side and leaves upturned, and the petals are translucent white (“skimmed milk”). The proposal to recognize C. cerastoides in its own genus, Dichodon, has some merit. See more: [ Ссылка ]
