BGFlora.eu

 

Genus Cerastium L.

L., Sp. PI. ed. 1 (1753) 437; Gen. PI. ed. 5 (1754) 199.

Fam:   Caryophyllaceae Juss.
Genus:  Cerastium L.
English Name: Mouse-ear chickweed

Description:

Herbaceous annual and perennial fibrous, less bare plants. Stems simple, unbranched or branched dichotomous. Leaves opposite, entire, sessile or with short handles. Hermaphrodite blossoms, symmetrical, usually located in outstretched dihazii and semi hoods; arranged by type 5, rarely 4. Sepals are divided to the base with webbed edge. Petals white, rarely white pink,up  to 1/3 or mid splitted or only the top concave, rarely undeveloped. Stamens 5 -10, rarely 4. The bars usually 5, sometimes 4, 3 or 6. Fruit single station, ovoid to cylindrical straight or curved at the tip smooth horn box, as long as the calyx, revealing the top with double that number teeth of the ledges. Seeds numerous, ovoid or kidney globular, verruca-like. Embryo almost annular.

Table for determining the types

1.  The bars 3. Fruit boxes revealed by six teeth ........................................................................................................................................... 2
1* The bars 5, rarely 4. Fruit boxes revealed by 10 mounts .......................................................................................................................... 3
2. Stem upright, covered with slightly sticky glands. Peduncle face. Bracts and sepals pimpled points back. Petals barely longer than the calyx. Fruit boxes with straight teeth. Annual plant ........................................................................ 2. Dubious rozhets - C. dubium (Bast.) Schwarz
2*  Stem creeping or rose slightly, the naked or only in the lower part of internodes straight hairs. Peduncle curved down. Bracts and sepals glandular back. Petals from 1.5 to 2.5 times longer than sepals. Fruit boxes with curved teeth out. Perennial ... 1. X X X  rozhets - C. cerastoides {L) Britton)
3.   Perennial. Stems basically rooted. Leaves of flowering stems with short leafy branches in the recesses ....................................................... 4
3* Annual plants. In the axils of the leaves never develop sterile branches …………........................................................................………. 13
4.  Petals equal to or slightly longer than the sepals, 4.5 - 7.5 mm long …………….......................................................................…………. 5
4*  Petals twice longer than sepals …………………………………………............................................................................……………. 6
5.  Plants, covered with 1 mm long hairs and more frequently with single scattered glands. Petals 3 - 5 mm long, almost equal to sepals. Fruit box 8 - 10 mm long. Inflorescence with many blossoms ……………………………............................ 11. Tussoc-like rozhets - C. caespitosum Gilib.
5* Plant densely covered with open longer than 1 mm cloth. Glands completely missing. Petals from 6.5 to 8 mm in length, no longer or barely longer than the sepals. Fruit box 10 - 20 mm in length. Inflorescence with 3 - 7 blossoms .............................. 10. X  X  X rozhets- C. fontanum Baumg.
6.  Leaves linear, linear lanceolate or lanceolate. In the axils of lower leaves at flowering stems with sterile branches listed on …....................... 7
6*  Leaves elliptical, ovate or lanceolate ovoid. in the bosom of the leaves no sterile branches ....................................................................... 11
7. Blossom handles after flowering face. Fruit boxes face with not tucked edges of the teeth ............................................................................ 8
7* Blossom handles after flowering after flowering pendulous, in fruit again upright. Fruit boxes curved on top and with rolled edges of the teeth ..................................................................................................................................................................................................................... 10
8. Gray fibrous plants. Seeds 1 - 1.3 mm in diameter, highly pimply ........................................ 5. Balkan rozhets - C. decalvans Schloss. et Vuk.
8*  Plants down, naked glands, or short feathered, but never fibrous ................................................................................................................ 9
9. Young stems bare or exceptionally short. cloth along a line at the bottom of each internode. Leaves pale green, sometimes fleshy. Bracts ovate lanceolate, bare ………………………... ................................................................................. 1. X  X  X rozhets - C. cerastoides {L.) Britton
9* Young stems short hairy round. Leaves dark green or greenish gray, the base ciliates, the rest bare, hard. Bracts feathered and ends with membranous edge ……………………………. ......................................................................... 6. Banat rozhets - C. banaticum (Roch.) Heuff.
10 (7*) All leaves or only sterile twigs densely fibrous fuzzy to straticulate. Inflorescence with many blossoms, dichotomous branching ................. ............................................................................................................................................... 5. Balkan rozhets - C. decalvans Schloss. et Vuk.
10* All leaves and stems covered with short spread and backward cloth, straticulate or almost naked. Inflorescence false hood, consisting of 5 - 15 blossoms ...........................................................................................................................................................7. Polish rozhets - C. arvense L.
11 (6*) High plant with loose tufts. Bracts and sepals blunt ....................................................................... 4. Mizian rozhets - C. moesiacum Friv.
11* Low mountain plants forming small dense tussocks. Bracts and sepals acute ….......................................................................................... 12
12.  Plant, densely covered with long curly hairs. Young leaves straticulate. Petals half longer than the calyx. Plant, 15 cm tal l............................... ……………............................................................................................................................................... 9. Woolly rozhets - C. lanatum Lam.
12* Thick fluffy short to fiber. The leaves on both sides densely fibrous and ciliates, sometimes naked. Petals almost twice longer than calyx. Plant, up to 20 cm .............................................................................................................................................................8. Alpine rozhets - C. aipimim L.
13 (3*) Naked or only basis with rare hairs protruding blue plants. The leaves 2, 2 fused at the base. Corolla shorter than the calyx. Fruit boxes face ripe to 20 mm long, with upright peduncle ............................................................................................... 3. X   X   X  rozhets - C. perfoliatam L.
13* Plants covered with simple or glandular hairs. The leaves are not connate. Corolla equal to or longer than the calyx. Fruit boxes up to 10 mm long, rarely more, long and often bent down handles ......................................................................................................................................... 14
14.  Sepals to tip hairy with simple not glandular protruding hairs. Leaves gray fibrous ....................................................................................... 15
14* Sepals without simple hairs sticking out the top, tunicates or glandular. Leaves green .................................................................................. 16
15. Blossoms with handles, longer than calyx collected outstretched dihazii. Filaments handles ciliates, rarely almost bare. Sepals 3 - 6.5 mm long ........................................................................................................................................................12. X  X  X rozhets - C. brachypetalum Pers.
15*  Blossoms with handles, shorter than the calyx collected in dense clusters cumulus. Filaments handles naked. Sepals 4 - 5 mm long ................... ………….....................................................................................................................................…... 13. X  X  X rozhets - C. glomeratam Thuill.
16. Petals basically ciliates .................................................................................................................................................................................17
16* Petals basically without cilia ....................................................................................................................................................................... 18
17. Sepals up to 3 - 7 mm long. Bracts with membranous tour. 8 - 25 cm tall plant …………….......……... 15 . Rocky rozhets - C petricola Panč.
17* Sepals 7 - 10 mm long. Tall plant 25 - 80 cm .......................................................................................... 14. Upright rozhets - C. rectum Friv.
18. Blossom handles longer than the calyx. Blossoms collected in spread dihazii. Fruit box 5 - 8 mm long ........................................................... 19
18* Blossom handles shorter than the calyx. Blossoms in dense semi canopies. Fruit box 15 mm long ................ 18. Slim ? rozhets - C. gracile Duf.
19. Bracts with membranous orbital strip ........................................................................................................................................................... 20
19* Bracts entirely herbaceous ......................................................................................................................... 18. Slim? Rozhets - C. gracile Duf.
20.  Bracts and sepals only the top end and close tunicates. Petals not more than 1.5 times longer than sepals. Stamens 10 .................................... .................................................................................................................................................................. 17. Crushed rozhets - C. pumilum Curt.
20* Bracts and sepals to half its tunicates, at least in the upper third. Petals barely longer or shorter than the sepals. Stamens 5 .............................. ........................................................................................................................................................... 16. X  X  X rozhets - C. semidecandmm L.

¹ developed by St. Valev.

From: „Флора на НР България”, том III, БАН, София, (1967)

Cerastium is a genus of annual, winter annual, or perennial plants belonging to the family Caryophyllaceae. They are commonly called mouse-ear chickweed. Species are found nearly worldwide but the greatest concentration is in the northern temperate regions. There are about 100 species.[1] A number are common weeds in fields and on disturbed ground.
Cerastium species are used as food plants by the larvae of some Lepidoptera species including Coleophora chalcogrammella (which feeds exclusively on Cerastium arvense) and Coleophora striatipennella (which has been recorded on Cerastium fontanum).
From Wikipedia, the free encyclopedia

References: „Флора на НР България”, том III, БАН, София, (1967)

Distribution in Bulgaria: (Conspectus of the Bulgarian Vascular Flora) = conspectus&gs_l= Zlc.

SPECIES:

Cerastium decalvans Schl. et Vuk - Balkan rozhets

Cerastium pumilum Curt - European chickweed