Let's start with the madrone (Arbutus menziesii) that I fell hopelessly in love with. As a result of this visit, I will never be fully happy unless I can grow a madrone of my own. This is unfortunate, because madrones are notoriously difficult to grow. But look at it! How could anyone not fall in love with this tree?
The arboretum also had a cousin of the madrone, a Baja California bird bush (Ornithostaphylos oppositifolia), but it was tiny and I couldn't get a good picture of it.
This is a young vine maple (Acer circinatum). It should eventually become a small tree.
This is a Rocky Mountain maple (Acer glabrum var. torreyi).
This is a big-leaf maple (Acer macrophyllum). It has big leaves.
The arboretum also had another native member of the maple family, a box elder (Acer negundo var. californicum), but I didn't get a good picture of it. It was a huge tree, though.
This is a buckeye (Aesculus californica) that had already turned brown in early July. I liked its bark.
This is an incense cedar (Calocedrus decurrens). It's a member of the cypress family.
Here is its cousin, an Alaskan yellow cedar (Cupressus nootkatensis).
These are coast redwoods (Sequoia sempervirens), also in the cypress family. The CSUS campus has a large number of these that are over 50 years old and therefore huge. Some of them are suckering around the base, possibly from the stress of being planted in the Sacramento Valley instead of in redwood forests. But this particular grove near the front entrance seems fairly healthy.
Here is another cousin, Rocky Mountain juniper (Juniperus scopulorum). Unlike the other three, this one isn't native to California. It's native to Oregon, Nevada, and Arizona, north to British Columbia and east to Texas.
The arboretum also had a native Western juniper (Juniperus occidentalis) and another native member of the cypress family, Lawson false-cypress (Chamaecyparis lawsoniana), but I didn't get good pictures of them. The Western juniper was about three or four feet tall, and the Lawson false-cypress was a large tree.
This is a bush anemone Carpenteria californica). It's in the mock orange family.
Here is its cousin, a mock orange (Philadelphia lewisii).
This is chaparral whitethorn (Ceanothus leucodermis).
Here is its close relation, tobacco brush (Ceanothus velutinus).
The arboretum also had a huge felt-leaf Catalina Island lilac (Ceanothus arboreus) with about ten main trunks, and an extremely tiny squaw carpet (Ceanothus prostratus). I didn't get good pictures of those.
This is Catalina Island mahogany (Cercocarpus traskiae). It's a member of the rose family. Its close relation, mountain mahogany (Cercocarpus betuloides), was also at the arboretum and looked virtually identical.
Here is their cousin, fern bush (Chamaebatiaria foliosa).
Toyon (Heteromeles arbutifolia) is also in the rose family. Here it is on the right, with deergrass (Muhlenbergia rigens)) to its left.
Ocean spray (Holodiscus discolor) is in the rose family too.
So is shrubby cinquefoil (Potentilla fruticosa). This one is also closely related to strawberries.
This is a chokecherry (Prunus virginiana var. demissa), also in the rose family. Its close relation, holly-leaf cherry (Prunus ilicifolia), was also at the arboretum and differed only in having curvier main trunks. There was also a Klamath plum (Prunus subcordata), but it was only a seedling and appeared to be dead.
Here are three more members of the rose family: jojoba (Simmondsia chinensis) and two species of osoberry (Osmaronia cerasiformis and Oemleria cerasifolia).
The arboretum contained - sort of - three other native members of the rose family as well: antelope bush (Purshia mexicana var. stansburyana), which was very small; double-flowered salmonberry (Rubus spectabilis 'Flore Pleno'), which was also very small; and Catalina ironwood (Lyonothamnus floribundus var. asplenifolius), which was only a tree stump.
Here's some more deergrass (Muhlenbergia rigens). I think that's Mexican feather grass in the background.
This is chaparral virgin's bower (Clematis lasiantha), a vine in the buttercup family.
This is brown dogwood (Cornus glabrata).
This is flowering ash (Fraxinus dipetala).
Here are two views of island bush-snapdragon (Galvezia speciosa).
Beardtongue (Penstemon corymbosus) is also in the snapdragon/figwort family. It was looking rather brown by early July.
So is this non-native cenizo (Leucophyllum frutescens), from Texas.
Here is a silk tassel bush (Garrya elliptica), with some of the tassel-like flowers visible among the leaves. The arboretum also had a box-leafed silk tassel (Garrya buxifolia), but it was very tiny.
This next picture shows a snowberry (Symphoricarpos albus) on the left, and a bladderpod (Isomeris arborea) on the right.
Here is a closeup of the snowberry. It's a member of the honeysuckle family.
This blue elderberry (Sambucus mexicana) is also in the honeysuckle family. There was a much larger blue elderberry that had a thick trunk, but it didn't have berries on it like this one. Back in April, I had photographed blue elderberry flowers at the Watt Avenue Recreation Area. By early July, the flowers had been replaced by fruit.
Bladdernut (Staphylea bolanderi), pictured below, should not be confused with bladderpod (Isomeris arborea), previously pictured.
This is pitcher sage (Lepechinia fragrans). It's a member of the mint family.
Cleveland sage (Salvia clevelandii), below, is also in the mint family. Whoever mistyped the name of the mint family - which should be spelled "Lamiaceae" - on the sign was apparently distracted by thoughts involving labia. Hmm.
Black sage (Salvia mellifera) is another close relation.
This silver bush lupine (Lupinus albifrons) looks almost identical to the healthier of the two in my back yard. It's in the pea family. The arboretum also had a false lupine (Thermopsis macrophylla) from the pea family, but I didn't get a good picture of that one.
Nevin's barberry (Mahonia nevinii) was covered with bright orange-yellow berries.
Wild cucumber (Marah fabaceus) had turned thoroughly brown by early July, although the ones at the Watt Avenue Recreation Area had been looking plenty green back in April.
This wax myrtle (Myrica californica) should turn into a small tree someday.
Sugar pine (Pinus lambertiana) was already a rather large tree.
But it had nothing on the humongous, nine-trunked gray pine (Pinus sabiniana). I've seen a lot of gray pines, but I've never seen another one nearly as huge as this. Some of the trunks didn't split off from the base until above the height of my head.
This Western hemlock (Tsuga heterophylla) is also in the pine family.
The arboretum also had a piñon pine (Pinus edulis) that was about three times my height, with a trunk I could easily encircle with my thumbs and forefingers, and a Douglas-fir Pseudotsuga menziesii) with a trunk about a foot in diameter. I didn't get good pictures of those.
This is a lemonade berry (Rhus integrifolia) at the base of some Eucalyptuses.
And this is a snowdrop bush (Styrax officinalis var. californica).
There were quite a few other plants I didn't photograph, including some natives: blue oak, valley oak, coast live oak, interior live oak, canyon live oak, California sycamore, desert olive, and the stump of a California nutmeg. But it was difficult to photograph tall trees when there were so many of them squeezed so close together and the foliage was all so far above my head - and there didn't seem to be much point in photographing the stumps.