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Sélection

Carex acuta

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Carex acuta
Individu
3
Critères
Critère Carex acuta
Période floraison ou sporulation
  • J
  • F
  • M
  • A
  • M
  • J
  • J
  • A
  • S
  • O
  • N
  • D
Rareté Assez rare (AR)
Hauteur mini-maxi 60 - 120 cm
Habitat
Zone humide, tourbière, rives
Nombre d'étamines
3
Longueur des épis inférieurs
4 à 7 cm
Supérieure à 7 cm
Position des utricules par rapport à l'axe
Dressée
Disposition des feuilles sur les rejets
Feuilles disposées sur 3 rangs
Aspect de la semence
Akène enfermé dans une boîte (utricule)
Détail de l'inflorescence
Terminale en grappe d'épis
Périgone et semence
Absent ou à soies très courtes < 0,5 mm
Nombre de stigmates
2
Couleurs des écailles en début de fructification
Noires ou brun noir
Biologie de la plante
Rhizomateuse formant une population dispersée
Pilosité du dos des utricules
Courtement papilleux
Couleur des feuilles
Au moins la face supérieure bien verte
Taille de l'utricule
Inférieur à 3 mm
Nervation de l'utricule à maturité
Nervation nette
Forme des écailles
Ovale obtuse
Densité des fleurs femelles sur les épis
Epis denses depuis leur base
Largeur des feuilles
5 à 8 mm
Longueur de l'inflorescence
Supérieure à 20 cm
Marges de l'utricule
Velues ou papilleuses comme le dos
Pilosité de la plante
Glabre
Longueur des pédoncules inférieurs
Supérieur à 4 cm
Distance entre les deux épis inférieurs
5 à 8 cm
8 à 12 cm
Type de plante
Plante herbacée à fleurs
  • À feuilles linéaires et longues gaines
Type biologique
Plante terrestre
  • Plante vivace souterraine
Disposition des feuilles
Tige aérienne avec feuilles
  • Alternes
Forme des feuilles indivises
Rapport longueur / largeur > 10
  • Linéaire
Bord des limbes
Echancrures < 20% du limbe
  • Entier à marge lisse ou scabre
Dimension de la fleur en mm
Plante à fleurs nues
  • Pièces florales absentes ou transformées en soies
Type d'inflorescence
Fleurs regroupées
  • Epi ou épi composé
Forme de la tige ou de la hampe florale
Tige anguleuse
  • Trigone
Ecailles des épis (Bractées florales)
Disposition en hélice
  • à 2 stériles à la base
Type d'inflorescence
Grappe d'épis bien différenciés (hétérostachyés)
  • Plusieurs épis terminaux entièrement mâles
Aspect de la première feuille bractéale
Non engainante et foliacée
  • Taille > à l'inflorescence
Ligule et anti-ligule
Absence d'anti-ligule, hauteur de la "ligule"
  • Ligule mesurant entre 2 à 4 mm
Bec de l'utricule
Inférieur à 0,5 mm
  • Inférieur à 0,3 mm
Nombre de pétales ou de tépales
Aucun pétale
Port de la plante
Tige dressée
Position de l'ovaire
Supère
Couleur dominante des pièces pétaloides
Pas de calice ni de corolle
Particularité des fleurs
Plante monoïque
Structure de la feuille
Feuille non découpée
  • Simple, non découpée
Type de fleur
Autre
  • Autre (Voir aide)
Type de fruit
Sec indéhiscent
  • Utricule (Cypéracées)
Phénologie
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Carte des observations
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