Comparaison

Photos

Carex pairae

Critères

Critère	Laîche de Paira Carex pairae
Période floraison ou sporulation	J F M A M J J A S O N D
Rareté	Extrêmement rare (RRR)
Hauteur mini-maxi	20 - 60 cm
Bord des limbes	Echancrures < 20% du limbe Entier à marge lisse ou scabre
Couleur dominante des pièces pétaloides	Pas de calice ni de corolle
Nombre de pétales ou de tépales	Aucun pétale
Position de l'ovaire	Supère
Aspect de la semence	Akène enfermé dans une boîte (utricule)
Détail de l'inflorescence	Terminale en épi d'épis
Disposition des feuilles sur les rejets	Feuilles disposées sur 3 rangs
Particularité des fleurs	Plante monoïque
Périgone et semence	Absent ou à soies très courtes < 0,5 mm
Nombre de stigmates	2
Couleur des feuilles	Au moins la face supérieure bien verte
Densité des fleurs femelles sur les épis	Epis denses depuis leur base
Biologie de la plante	Cespiteuse formant une touffe bien délimitée
Couleurs des écailles en début de fructification	Verdâtres ou blanchâtres Brunes ou roussâtres à bord membraneux étroit
Forme des écailles	Ovale aristée ou acuminée
Largeur des feuilles	2 à 3 mm
Longueur des épis inférieurs	Inférieure à 1 cm
Marges de l'utricule	Non ailées et scabres
Nervation de l'utricule à maturité	Nervation absente ou peu visible
Pilosité de la plante	Glabre
Pilosité du dos des utricules	Glabre
Position des utricules par rapport à l'axe	Étalée
Taille de l'utricule	4 à 5 mm 3 à 4 mm
Longueur de l'inflorescence	Inférieure à 3 cm 3 à 8 cm
Longueur des pédoncules inférieurs	Épis inférieurs sessiles
Distance entre les deux épis inférieurs	Moins de 1,5 cm
Habitat	Prairie, pelouse
Nombre d'étamines	3
Port de la plante	Tige dressée
Type de plante	Plante herbacée à fleurs À feuilles linéaires et longues gaines
Type biologique	Plante terrestre Plante vivace en surface
Disposition des feuilles	Tige aérienne avec feuilles Alternes
Structure de la feuille	Feuille non découpée Simple, non découpée
Forme des feuilles indivises	Rapport longueur / largeur > 10 Linéaire
Type de fleur	Autre Autre (Voir aide)
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
Type de fruit	Sec indéhiscent Akène simple
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	Épi d'épis peu différenciés (homostachyés) Epis homogènes, tous femelles à leur base
Aspect de la première feuille bractéale	Non engainante et écailleuse ou filiforme Taille inférieure à l'épi Taille > à l'épi, < à l'inflorescence
Ligule et anti-ligule	Absence d'anti-ligule, hauteur de la "ligule" Ligule comprise entre 1 et 2 mm
Bec de l'utricule	Entre 0,5 et 2 mm Entre 0,5 et 1 mm

Carte des observations

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