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Updated: August 15, 2024
The inner ones may be linear or linear-lanceolate, with or without appendages below the tip; the outer ones may be similar and only shorter, or noticeably larger, erect, spreading or even reflexed, and the color of the involucre may be a pure green or glaucous; the leaves may be nearly entire or pinnatifid, or sinuate-dentate, or very deeply runcinate-pinnatifid, or even pinnately divided, the whole plant being more or less glabrous.
"Those leaves are 'pinnately compound' and 'palmately compound' according as their leaflets are arranged like a feather or like the palm of your hand. When you begin to notice the edges of leaves you see that there is about every degree of cutting between the margin that is quite smooth and the margin that is so deeply cut that it is almost a compound leaf.
The compound leaves correspond to these modes of venation; they are either pinnately or palmately compound. These ribs and veins are the woody framework of the leaf, supporting the soft green pulp. "Physiologically, leaves are green expansions borne by the stern, outspread in the air and light, in which assimilation and the processes connected with it are carried on."
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