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1 Sterile leaf blade (trophophore) leaflets linear to narrow-ovate, the apex obtuse to acuminate, the margins shallowly to deeply lobed; at least the tip of the sterile leaf blade (trophophore) reflexed in bud. | |
2 Sterile leaf blade (trophophore) deltate (widest at base), with 3 axes, usually ± sessile; fertile leaf (sporophore) reflexed in bud | |
2 Sterile leaf blade (trophophore) oblong to ovate, with 1 main axis, usually stalked; fertile leaf (sporophore) mainly erect in bud, only the very tip curved over | |
1 Sterile leaf blade (trophophore) leaflets nearly orbicular to obovate or flabellate, the apex rounded to truncate, the margins entire or distally few-lobed; sterile leaf blade (trophophore) and fertile leaf (sporophore) erect in bud or only the extreme tip of the sterile leaf blade (trophophore) slightly inclined. | |
3 Sterile leaf blade (trophophore) usually with evident lobes, the first and second pairs of leaflets separated by a similar or slightly longer distance than the second and third pairs of leaflets. | |
5 Lowest pair of sterile leaf blade (trophophore) lobes or leaflets, when present, often noticeably larger and more complex than the next apical pair; lobes varying from oblong to flabellate to reniform; stalk of sterile leaf blade (trophophore) usually borne near base of plant (sometimes toward mid-height); [primarily of open areas such as fields, shores, and banks] | |
5 Lowest pair of sterile leaf blade (trophophore) lobes or leaflets, when present, not obviously larger than the next apical pair; lobes on well-developed plants usually square-oblong to obovate-oblong; stalk of sterile leaf blade (trophophore) inserted high on common stalk, usually at or above mid-height of plant; [primarily of forested wetlands] |