I have decided this is Pinus parviflora 'Adcock's Dwarf', but would appreciate being corrected. We were fooled by the new growth that looked like thicker single leaves, but I can see now that they are bundled leaves. This Pinus densiflora 'Umbraculifera' has an amazing number of cones clustered together. The Larix speciosa is in the Asian Garden, not far from the entrance. It has very flashy cones.