- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
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- Dichotomous Key
A collection of Corylus that was originally determined as C. avellana L. or “near it” was taken from near a nursery in Hartford County, CT—9 Jul 1909, Bissell s.n. ( GH!). The specimen has an unmounted annotation that reads “= heterophylla”, a statement that, if applying to the synonymy, is untrue. The plant does not appear to be C. heterophylla Fisch. & Trautv. because it lacks the characteristic leaf blade apex of that species (+/- truncate with a central acumination). The plant also does not appear to be C. avellana because it lacks the leaf blade outline (orbicular to broad-obovate) and has acute stipules. The specimen is vegetative and appears equivocal.
Show photos of: Each photo represents one species in this genus.