Ageratum (Asteroideae- Eupatorieae)


3 (2)Peduncles minutely puberulent and sparsely to densely pilose, eglandular; phyllaries oblong-lanceolate, abruptly tapering to subulate tips 0.5–1 mm, glabrous or sparsely pilose, margins often ciliate, abaxial faces eglandular 3 Ageratum conyzoides
+Peduncles mixed pilose, stipitate-glandular, and viscid-puberulent; phyllaries narrowly lanceolate, gradually tapering to indurate-subulate tips 0.8–2 mm, margins not ciliate or inconspicuously ciliate, abaxial faces stipitate-glandular and sparsely to densely pilose 4 Ageratum houstonianum

1Leaves basally cordate or truncate; phyllaries narrowly lanceolate, apex long acuminate, margin entire, stipitate glandular, with long hairs. 1 A. houstonianum
+Leaves basally obtusely or broadly cuneate; phyllaries broad, oblong or lanceolate-oblong, acute, glabrous or with long, non-viscid hairs, eglandular. 2 A. conyzoides
 

Comparison of Ageratum conyzoides L. & Ageratum houstonianum Mill. as below:

https://08511630493324166816.googlegroups.com/attach/7e763578ccb3c9a0/A.conyzoides&A.haustonianum_DSR_3.JPG?part=0.1&view=1&vt=ANaJVrFMmkunqZaO1kIcO800OnMncAubfcD7cQtMSILMls-nr8hJSraSwy-DJhxfox6QrTvcbo8J6q4baJAeQZr_3Ql_fK82uMvmWKYE9kXJBDPMr3rXOq4



https://08511630493324166816.googlegroups.com/attach/41a7e977f4456/IMG_20171229_120410.jpg?part=0.5&view=1&vt=ANaJVrGHcHYwZg46t86HNgLNQ0zQGp2-GXN4GQUSQhyG-dGcv4bVmXJgHVKEKXEWFN9S_ddk1uQdLFF5GobcnKIBXxY8u0WFnrWqlzJr2g8gP8TOpvfMYeQ
https://08511630493324166816.googlegroups.com/attach/41a7e977f4456/IMG_20171229_120445.jpg?part=0.4&view=1&vt=ANaJVrGkA62s49rm-iaB1FL1Gn0dxk1dLtAZzreIzQo9hkHqTGPsSX3yBVmpaieiOrwxXpPsizq8tAve4dqyChNedMEPojZIlbEKf6VzNtQilkCb0UPdskE
 
https://08511630493324166816.googlegroups.com/attach/41a7e977f4456/IMG_20171118_120505.jpg?part=0.3&view=1&vt=ANaJVrEYSkGz6zj__8zG2q1e4suuj5yqhrostHrmhpISUSE-JfGCiDbrq3tOdkisUBmGlGobqt9r0jB1P1Nfx_429A_Mfg3DRkIM2ClCZE0warRwjbNf3D0
https://08511630493324166816.googlegroups.com/attach/41a7e977f4456/IMG_20171229_120500.jpg?part=0.2&view=1&vt=ANaJVrHbReSi3rrL5UOyC8I_I-ZLStOT2Qe_VhJhS8u77xR8I-vHYJvaPMz0GaRzf59SufV7KkbiNwVKjp1hVup6okmCek1f_aFkBoNCpTnrN3CtT2bt8h4
https://08511630493324166816.googlegroups.com/attach/41a7e977f4456/IMG_20171229_120512.jpg?part=0.1&view=1&vt=ANaJVrFzdUJSFY6AOqVD8BVpRUR4lUgtyjsjWmUPTVopsdkjUA3vDgbUanHKXPP2SaJChP1DNV1EmEKwgNXW0Ml8_C_zRPUGNVCRpyF3Rs3d2vv_17AzkEQ
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Inflorescence%20close-up.JPG?part=0.6&view=1&vt=ANaJVrEdAjp08lFMUoCMF5pIrmCVHFTpZX1PWv7PkppubluEEuSffZ_TprsDlP55-nUceQYKpCwSFH0qBimbthUXoWXtvucXU-5odavzQqWjMNbPc9w021o
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Ageratum%20sp%20(1).JPG?part=0.1&view=1&vt=ANaJVrHHxsXiOy6RX-8jia5w2ZAy9jhIWr5YgCv0gn8m7NJBwkLZoKPvaEiLZ01bd2bo8qGKuIVcKa8xvBUWX5IImwov8UIsms223ZYlhRdXNjEhILslg54
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Ageratum%20sp%20(2).JPG?part=0.2&view=1&vt=ANaJVrEJKxSfURrFX1tWxYcWSB_9WLZq7kbFUO1cMw2p--wmNgWcGQX-58cSM4xp6jJqUR2Wy9Ru4eTmxvAI10nehv95hqr6qQ6s05sWeXURENM4GKcT_eE
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Ageratum%20sp%20(4).JPG?part=0.4&view=1&vt=ANaJVrGii33pikbQ2SbteG_SXe49aQcpHGEJ3yBq1pAlSmGsfZ0SxcMIDRcTJXh5_cSqEAs8IQhYnWHyfVGYtPdcs-UaLM31SBlNH09P5H4k76CX3GN8LhU
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Ageratum%20sp%20(5).JPG?part=0.5&view=1&vt=ANaJVrE5BryXf42KvBhk3HG5s87M1eyJ3wsureEwEx-a-mcQyt5khr18DTNQzyYF43dxTTFgECg6obLAo4QT1WSDfbDyxb5MTqgEPlQQqpUdsvb_SeQS8Uc
 
https://08511630493324166816.googlegroups.com/attach/21511e0816b24/Ageratum%20sp%20(3).JPG?part=0.3&view=1&vt=ANaJVrEfUPLvp872WA80An4XCJpIp46PinClNHfihGgR30ywVxIekVtUHMlyWuBkXl0P1mu7_Sl8a7-4pyZH9x21P0zC1AinQEe2STkvo8GsFdylFzzb6lI
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(8).JPG?part=0.6&view=1&vt=ANaJVrG_VhzRnjT17WgGIiXAQgSSoZabwEHNferzUFcAon8ZyVeB2a2b6jMaYck_Ax9laTMaA5P9FRpNbst1u_aLqNYovWcerWM1bSSwgmer8abK-0hkX7U
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(4).JPG?part=0.3&view=1&vt=ANaJVrGlQb7py_1zSkdexls-Q1Qoqm28f_C_jGyqvNh6sg714RhiRsqvl9YQAcXH2fzdHreOWd_shxvjORq2eMEZGvoGDql7br6xe6NVZLguGo4Res2N9ak
 
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(7).JPG?part=0.5&view=1&vt=ANaJVrFBuewi9JZzThE06mo7tp6td3czMCmvchdJCLDAM7o8RgEVanbZCi0IgMjHP8rgkByS89aHrTvRXe9z8T9eWcwZJPqwIeug7EV2Kj1Z9smdwo5zRH8
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(1).JPG?part=0.1&view=1&vt=ANaJVrEc6_DgSjpNdPNEEunn0NPlGOlEuP2smRe9qG_w5V7c0d8jq92Lz7WTazp73lCP9vI30muQeWMq-ytmh9ok7tzUvwIkDyA9Joebah4R0ARQoDdFd4M
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(6).JPG?part=0.4&view=1&vt=ANaJVrFuEaj2kFA6Z_d8-psYTlwufOEgZwPaTuRAxu0iLozFoHYkOuQESDLoLGVZLdSnKDigj5nRerK5uJmAC-5jrVTlWfvWV_TqDcVlojzpt182m42_PvI
https://08511630493324166816.googlegroups.com/attach/19435ca931f1396c/Ageratum%20conyzoides%20(2).JPG?part=0.2&view=1&vt=ANaJVrGfLsbGGeYtZ813NHOq1AwZVMsA4PiPo_QR58KaNRKr6-GEYFBQyETz5FPogxROat1VMcVNCjh4UDRraMpFWf1OF_pyqs_W3e2d37ImDORbOGx3Hvo
   
Ageratum L. genus is represented in India by two species- A. conyzoides and A.houstonianum.
These closely related pantropica weed species can be differentiated as follows:
Involucral bracts linear, sharply acute-acuminate, sparsely hairy; Corolla of the florets 1.5mm long, shorter than awned pappus scale.... A.conyzoides L.
Involucral bracts linear setaceous, densely hairy; Corolla of the florets 2.5mm long, as long as or longer than awned pappus .... A.haustonianum Mill.

It (Ageratum houstonianum) has larger and robust plants and flowerheads with more florets than A.conyzoides.  

In A conyzoides plants and phyllaries are not that densely hairy, and heads are smaller and more spreading 
 
Thicker cordate leaves and longer hairs especially on involucre bracts are clearly seen in Ageratum houstonianum.  

1 species is done by ...

Pl. go through Ageratum page (‎Asteraceae (Compositae)‎) with images of species in efloraofindia (mainly done by ...).

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