I only have maybe 10 trees in bonsai pots. A ponderosa, a juniper, several azalea, and a JBP
I have at least 48 species as "sticks in pots" - various stages of growing out in plastic pots, Anderson flats, at least 30 are in Anderson flats, and other growing out containers. So not "really" bonsai. I think the total is about 46, at least that is what I can remember.
Juniper Itoigawa, Kiushu, & generic Shimpaku
Juniper horizontalis - 2 varieties
Picea glauca densata (black hills spruce), Picea orientalis - Oriental spruce, Picea omrika - Serbian spruce,
Picea pungens - Colorado blue spruce - 3 named cultivars,
Picea engelmannii - 'Bushes' Lace' weeping engelmann spruce.
Pinus banksiana - Jack Pine- 2 named varieties grafted, & several seedlings.
Pinus bungeana - Chinese lacebark pines - several seedlings.
Pinus parviflora - Japanese white pine - 3 grafted named varieties and 2 seedlings.
Pinus ponderosa - have 3 from Andy Smith
Pinus thunbergii - 4 different cork bark pine varieties
Pinus rigida - Pitch pine - seedlings.
Pinus lambertina = Sugar pine - seed, not germinated yet.
Pinus strobus - a few seedlings for eventual grafting understock
Pinus nigra - 5 year old seedlings for eventual grafting understock.
Taxus florida - Florida yew, a rare species of Taxus, but basically looks like & grows like Taxus baccata.
Tsuga canadensis - 2 varieties
Chamaecyparis obtusa - Hinoki - 4 different cultivars.
Thuja occidentalis - 2 named from nursery material, one collected, and several seedlings.
Azalea - 8 or 9 varieties, 5 different named Satsuki types, and a couple no name types, and one deciduous type
Vaccinium corymbosum - highbush blueberries - 5 or so named varieties, only a couple in bonsai pots.
Amelanchier grandiflora - Serviceberry
Malus - named weeping crab - I did the grafting to create this one.
Chaenomeles - 4 varieties flowering quince
Celastrus sp. - Bittersweet vine - don't know which species, asian or native north american
Parthenocissus virginiana - Virginia Creeper Vine
Wisteria macrostachya - Kentucky wisteria - one of the two native species
Chionanthus virginicus - American Fringe Tree - have one male, one female.
Diospyros virginiana - American persimmon - have a couple grafted females, and a few dozen seedlings.
Acer tartaricum - Amur maple,
Acer rubrum? sacharum? - it is either sugar maple or red maple, small clump from farm.
Acer species not determined - a volunteer weed seedling in a pot of a tree from North Carolina - it has developed striped bark. now in its 5th year.
Ulmus rubra - slippery elm or red elm
Ulmus thomasii - northern cedar elm, or also called rock elm - recently collected, not positive on the ID yet.
Ulmus pumila - Siberian elm
U;mus parvifolia - Chinese elm, 2 varieties.
Carpinus caroliniana - hornbeam
Carpinus corieana
Ostrya virginiana - hop flowered hornbeam.
Ginkgo
Metasequoia
Ficus collected in Chiapas, Mexico,
Eugenia sp
Annona cherimoya
Ochna integrifolia - dropped its leaves, not 100% sure its still alive, they are deciduous, but only for brief periods.
Ficus pumila
Bursera fagaroides
Lindera benzonin