Acacia adunca       653

Petit arbre ou grand arbuste. Facilement reconnaissable grâce à ses feuilles très fines, longues et plates de 5 à 12 cm, rappelant par exemple celles des genêts, cette particularité lui donne une certaine élégance. Elles sont d'un vert vif, tandis que les jeunes pousses naissent avec une couleur tirant sur le rouge. Sa floraison est également remarquable. Entre février et avril, les fleurs sont regroupées par quinzaine ou vingtaines sur des grappes, que l'on appelle racèmes. Elles dégagent une agréable odeur et forment des bouquets très esthétiques, d'un jaune or.

Appartenance
Le Genre: Acacia Sous-genre: Phyllodineae Section: Acacia ayant les caractères suivants : Arbres ou arbustes, parfois prostrés. Branches désarmées. stipules normalement présentes et scarieuses, rarement épineuses. Feuilles bipennées ou plus communément modifiées en phyllodes polymorphes, rarement réduites en écailles ou absentes. Inflorescences simples ou racémeuses, parfois paniculées ; fleurs disposées en têtes ou en épis ; têtes sans involucelle sur le pédoncule; fleurs sans gynophore.

Le sous-genre Phyllodineae contient environ 950 espèces, dont la majorité sont confinées à l'Australie ; on estime qu'il existe au moins 50 espèces supplémentaires, non encore décrites.

C'est le plus grand groupe du sous-genre Phyllodineae. Il est répandu en Australie, les zones les plus riches en espèces se trouvant au sud du tropique du Capricorne, dans les zones tempérées et semi-arides adjacentes de l'est, du sud-est et du sud-ouest de l'Australie ; la section est peu représentée dans le nord tropical/subtropical du continent. Il n'y a pas d'espèce indigène de la section Phyllodineae présente en dehors de l'Australie.

L'acacia adunca supporte les climats rudes, avec une bonne résistance au gel. Toutefois son point faible réside dans un excès d'humidité. Un sol bien drainant est donc essentiel pour planter l'arbuste, qui appréciera davantage un climat relativement sec.

Sources
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- Two new Acacia species (Leguminosae: Mimosoideae) from banded ironstone ranges in the Midwest region of south-west Western Australia. Nuytsia Vol. 17 pag. 263-272. Maslin, B. R. (Bruce Roger), and Buscumb, C (2007). Address
- Two new species of Acacia (Fabaceae: Mimosoideae) with conservation significance from Banded Iron Formation ranges in the vicinity of Koolyanobbing, Western Australia. Nuytsia Vol. 24 pag. 131-138. Maslin, Bruce R and others (2014). Address
- Two new species of Acacia (Leguminosae: Mimosoideae) from the Koolanooka Hills in the northern wheatbelt region of south-west Western Australia. Nuytsia Vol. 17 pag. 253-262. Maslin, Bruce and C., Buscumb, (2007). ResearchGate
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- Assimilation and Resource Allocation for Growth in Acacia auriculiformis. Recent Developments in Acacia Planting pag. 313. Montagul, KD and WOOl, KC (1997). Address
- Clonal Tests and Propagation Options for Natural Hybrids between Acacia mangium and A. auriculiformis. Recent Developments in Acacia Planting pag. 203. Le Dinh Kha, Nguyen Dinh Hai and Vinh, Ho Quang (1997). Address
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- Evaluation of clonal strategies for tropical acacias. pag. 197-202. Walker, SM and Haines, RJ (1997). Address
- Genetic improvement and physiology of Acacia auriculiformis. pag. 292-298. Woo, KC and Montagu, KD and Metcalfe, AJ and Puangchit, L and Luangviriyasaeng, V and Jiwarawa, t P and Changtragoon, S (1997). Address
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- Growth and performance of Acacia crassicarpa seedling seed orchards in South Sumatra, Indonesia. Recent Developments in Acacia Planting pag. 359. Nirsatmanto, Arif (1997). Address
- Growth, marcottability and photosynthetic rate of Acacia crassicarpa provenances at Serdang, Malaysia. pag. 299-304. Awang, Kamis and Jamahari, Sulaiman and Abd Shukor, NA (1998). Address
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- Insect pests of tropical acacias: a new project in Southeast Asia and Northern Australia. Recent Developments in Acacia Plantings. ACIAR Proceedings Vol. 82 pag. 234-239. Wylie, R and Floyd, R and Elliot, H and Khen, CV and Intachat, Jurie and Hutacharern, C and Tubtim, N and Kha, LD and Van Do, N and Rachmatsjah, O and others (1997). Address
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- Management and use of ex situ genetic resources of some tropical Acacia species in Queensland. pag. 184-196. Nikles, DG and Harwood, CE and Robson, KJ and Pomroy, PC and Keenan, RJ (1997). Address
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Type biologique: arbre
Rusticité: -10ºC
Couleur des feuilles: vert foncé
Couleur des fleurs: jaune
Classé Sensible à la bactérie Xylella fastidiosa La Direction Régionale de l'Alimentation, de l'Agriculture et de la Forêt.

Spécifications pour le bassin Méditerranéen
Taille adulte (h x l): 8m x 5m
Exposition: plein soleil (Heures de soleil: >6h
Feuillage: persistant
Croissance: rapide
Floraison de Octobre jusqu'a Mai
Fruits mûrs de Juin jusqu'a Juillet

Informations spécifiques pour notre jardin
Substrat: 20%Compost+80%Sable rivière
Arrosage: Capteur pH 6,5 Mi-sec
Suite logique de conteneurs pour: Eucalyptus; plaque forestier, pot forestier 3L, Airpot 12L, Airpot 50L, Airpot 800L
La multiplication se fait par bouturage
Unités dans le jardin: 1x

Écologie dans son pays d'origine
Pluviométrie: 600-900mm
Sol argileux: très
Sol sablonneux: très

PRINTEMPS Tremper les graines dans de l'eau chaude à 60°C pendant 60h (Changer l'eau toutes les 12 heures) jusqu'à ce que les graines gonflent. Semer les graines à 5mm de profondeur dans le Terreau drainant pour semis entre 18-22°C. Pendant la germination garder le substrat humide et à la lumière du jour. Les graines germent en 5-6 semaines.
Le poids moyen des graines est 26,8 par gramme (0,03732g).
La viabilité des graines, gardées sous des bonnes conditions, est 10 ans.

Instructions de bouturage
Prélevez les boutures à la fin du printemps, trempez-les dans une préparation hormonale pour bouturage. Plantez-les dans un substrat riche en perlite et gardez-les suffisamment humides dans des sacs de congélation scellés.