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What is an Herbarium?
Genus Descriptions
Species Descriptions
Ontario FEC V-Types
Bibliography
Terminology
Who Collects the Plants?
Collector Biographies
Nomenclature Primer
Website Information
Northern Ontario Plant Database
Leaf Apices
Attenuate
a sharp-pointed apex with concave margins that form an angle less than (<) 45 degrees.
Acuminate
a sharp-pointed apex with straight or convex margins that form an angle less than (<) 45 degrees.
Acute
an pointed apex with margins that form an angle between 45 and 90 degrees.
Obtuse
a blunt apex with margins that form an angle greater than (>) 90 degrees.
Rounded
an curved apex with margins that form a smooth arc.
Caudate
an attenuate apex with a slender tail-like appendage at the tip.
Cuspidate
an acute apex with a stiff tip or cusp.
Mucronate
with a small extension of the midrib barely extending beyond the blade apex.
Emarginate
with a shallow depression at the apex, not exceeding ? of the distance to the centre of the leaf blade.
Truncate
a broad, flat apex, abruptly ending at right angles to the midvein.
Retuse
a rounded summit with a shallow depression at the apex, not exceeding 1/16 of the distance to the centre of the leaf blade.
Obcordate
apex with prominent, rounded lobes, cut ? to ¼ of the distance to the centre of the leaf blade.
Cleft
apex divided into rounded or straight-margined lobes, cut ¼ to ½ of the distance to the centre of the leaf blade.
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