View source for Vachellia

{{Treatment/ID
|accepted_name=Vachellia
|accepted_authority=Wight & Arnott
|publications={{Treatment/Publication
|title=Prodr. Fl. Ind. Orient.
|place=1: 272. 1834
|year=1834
}}
|common_names=Acacia
|basionyms=
|synonyms=
|hierarchy=Fabaceae;Fabaceae subfam. Caesalpinioideaemimosoidclade;Vachellia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Fabaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Fabaceae subfam. Caesalpinioideaemimosoidclade]]</div><div class="higher-taxon"><small>genus</small>[[Vachellia]]</div></div>
|etymology=For Rev. George Harvey Vachell, 1799–1839, plant collector in China
|volume=Volume 11
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs </b>or trees, armed. <b>Stems</b> erect to spreading, glabrous or pubescent; twigs terete [angulate], some flexuous, short shoots usually present. <b>Leaves</b> alternate, even-bipinnate, usually clustered on short shoots, leaves of short shoots usually smaller, with fewer pinna pairs and leaflets than alternately arranged leaves on faster growing branches; stipules present, spinose, paired at nodes, [asymmetric], straight to curved, woody, in some species enlarged and inhabited by ants; petiolate, petiole channeled, glabrous or pubescent, petiolar gland 1–30; pinnae 1–45[–60] pairs, mostly opposite; leaflets 2–47 pairs per pinna, usually opposite, sessile or subsessile, blade margins entire, surfaces glabrous or pubescent. <b>Inflorescences</b> 50–180(–1500+)-flowered, primarily axillary, globose heads or cylindrical spikes, solitary or clustered in leaf axis or on short shoots, sometimes pseudoracemes; bracts present. <b>Flowers</b> mimosoid; calyx campanulate, lobes 4 or 5; corolla yellow, white, or cream, lobes 4 or 5; stamens 15–120, distinct, exserted, yellow or white, [gold or creamy white]; anthers dorsifixed, eglandular; ovary sessile or short-stipitate, usually glabrous; style and stigma filiform. <b>Fruits</b> legumes, stipitate, flattened to terete, straight to falcate, linear to oblong, usually dehiscing along both sutures, sometimes indehiscent, glabrous or pubescent. <b>Seeds</b> 6–10(–20), uniseriate or biseriate, sometimes flattened, ovoid to ellipsoid, sometimes surrounded by pulp; pleurogram U-shaped. <b>x</b> = 13.</span><!--

-->{{Treatment/Body
|distribution=s;sw United States;Mexico;West Indies;Central America;South America;Europe;Asia;Africa;Australia;introduced nearly worldwide in tropical to warm temperate regions.
|discussion=<p>Species ca. 160 (10 in the flora).</p><!--
--><p>There is considerable evidence that Acacia in the broad sense is not a natural or monophyletic group. Largely because the segregation of Acacia in the broad sense into at least five genera would result in requiring a change in generic epithet for about 1000 Australian species of subg. Phyllodineae (de Candolle) Seringe, at the 17th International Botanical Congress in 2005, the type of Acacia was changed from A. scorpioides (Linnaeus) W. F. Wright to the Australian species A. penninervis (B. R. Maslin 2008; J. McNeill and N. J. Turland 2010). As a result of this change, plants of former Acacia subg. Acacia should be placed in Vachellia (Maslin et al. 2003; D. S. Seigler and J. E. Ebinger 2005).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Inflorescences cylindrical spikes.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Stipular spines enlarged, 4–10 mm wide near base; pinnae 3–14 pairs.
|[[Vachellia cornigera|Vachellia cornigera]]
|-id=key-0-2
|2
|Stipular spines 0.6–2.1 mm wide near base; pinnae 1 pair.
|[[Vachellia rigidula|Vachellia rigidula]]
|-id=key-0-1
|1
|Inflorescences globose heads.
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Leaflet blades 16–28 mm.
|[[Vachellia choriophylla|Vachellia choriophylla]]
|-id=key-0-3
|3
|Leaflet blades 1.1–6.3 mm.
|[[#key-0-4| > 4]]
|-id=key-0-4
|4
|Involucral bracts near middle of peduncles.
|[[#key-0-5| > 5]]
|-id=key-0-5
|5
|Leaflet blades linear and subterete.
|[[Vachellia schottii|Vachellia schottii]]
|-id=key-0-5
|5
|Leaflet blades elliptic, oblong, or oval and flat.
|[[#key-0-6| > 6]]
|-id=key-0-6
|6
|Stems not glutinous; pinnae 2–8 pairs.
|[[Vachellia constricta|Vachellia constricta]]
|-id=key-0-6
|6
|Stems glutinous; pinnae 1 or 2(or 3) pairs.
|[[Vachellia vernicosa|Vachellia vernicosa]]
|-id=key-0-4
|4
|Involucral bracts at base of heads.
|[[#key-0-7| > 7]]
|-id=key-0-7
|7
|Pinnae 12–45 pairs.
|[[Vachellia macracantha|Vachellia macracantha]]
|-id=key-0-7
|7
|Pinnae 1–8 pairs.
|[[#key-0-8| > 8]]
|-id=key-0-8
|8
|Petiolar glands donut-shaped, at or just below lowermost pinnae.
|[[Vachellia bravoensis|Vachellia bravoensis]]
|-id=key-0-8
|8
|Petiolar glands circular to slightly elongated, not donut-shaped, usually medial on petiole.
|[[#key-0-9| > 9]]
|-id=key-0-9
|9
|Legumes nearly terete in cross section, not constricted between seeds; seeds biseriate or irregularly arranged.
|[[Vachellia farnesiana|Vachellia farnesiana]]
|-id=key-0-9
|9
|Legumes narrowly elliptic in cross section, constricted between seeds; seeds uniseriate.
|[[#key-0-10| > 10]]
|-id=key-0-10
|10
|Stems usually slightly flexuous; petioles 6–12(–17) mm.
|[[Vachellia farnesiana|Vachellia farnesiana]]
|-id=key-0-10
|10
|Stems strongly flexuous; petioles 3–7 mm.
|[[Vachellia tortuosa|Vachellia tortuosa]]
|}
</div></div><!--

-->{{#Taxon:
name=Vachellia
|author=John E. Ebinger;David S. Seigler
|authority=Wight & Arnott
|rank=genus
|parent rank=subfamily
|synonyms=
|basionyms=
|family=Fabaceae
|distribution=s;sw United States;Mexico;West Indies;Central America;South America;Europe;Asia;Africa;Australia;introduced nearly worldwide in tropical to warm temperate regions.
|reference=None
|publication title=Prodr. Fl. Ind. Orient.
|publication year=1834
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/master/coarse_grained_fna_xml/V11/V11_218.xml
|subfamily=Fabaceae subfam. Caesalpinioideaemimosoidclade
|genus=Vachellia
}}<!--

-->[[Category:Treatment]][[Category:Fabaceae subfam. Caesalpinioideaemimosoidclade]]