Key to Ageratina

View taxon page for Ageratina

(For a list of species in Ageratina, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Heads generally solitary (rarely 2–3) ..... A. shastensis

1' Heads clustered

2. Leaves 

alternate 

1. Arranged singly, often spirally, along an axis - e.g., one leaf per node. 2. Occurring in different ranks, appearing to be between, not directly above or below, as 'stamens alternate petals'.

 distally on stem; heads 8–10 mm ..... A. occidentalis

2' Leaves 

opposite 

1. Arranged in pairs along an axis - e.g., two leaves per node. 2. Occurring in the same rank, directly above or below, as 'stamens opposite petals'. 3. Located directly across from.

throughout; heads 6–8 mm

3. Leaf 

blade 

Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped.

generally 40–100 mm; 

petiole 

Leaf stalk, connecting leaf blade to stem; sometimes more or less indistinct.

generally 20–40 mm ..... A. adenophora

3' Leaf blade generally 15–55 mm; petiole generally 5–10 mm ..... A. herbacea

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