Ptelea crenulata aka California Hoptree

Ptelea crenulata is a deciduous shrub or small tree from California. Its common names include California hoptree and western hoptree. It belongs to Rutaceae, the rue family. Its native range includes California’s Inner North Coast Ranges. It also grows in the Sierra Nevada foothills and San Francisco Bay Area. Kew places this species in the temperate biome. It is not native to Oregon or to Britain and Ireland.

The plant branches low and has a broadleaf crown. It reaches 6.5–15 feet (2–4.5 metres) tall, with a similar width. This gives gardeners a guide to its space needs. Its form can range from a shrub to a small tree. It loses its leaves rather than keeping them year-round. The reported size makes it a small woody plant, not a large shade tree.

The leaves grow alternately along the stems. Each leaf is pinnately compound, with three leaflets. The leaflets range from narrow and lance-shaped to broadest near the tip. Their tips are pointed, while their bases are rounded or wedge-shaped. Their edges may have teeth or remain smooth. The upper face is dark green and lacks hairs. Some hairs cover the lower face of each leaflet. Small, translucent glands dot the leaves. Holding a leaf against strong light makes these glands visible. A stalk connects each compound leaf to the stem. The individual leaflets lack stalks of their own.

Small, scented flowers grow in clusters at the stem tips. These clusters have the botanical name cymes. Each flower has four or five greenish-white petals. The flowers offer scent but do not make a bold display. The fruit is a samara, a dry fruit with a wing. It has a nearly round outline and turns straw-colored when ripe. The wing is a clear feature for identifying the fruit.

For cultivation, Oregon State recommends sun and dry, well-drained soil. These are the supported conditions for choosing a planting site. Its low branches, compound leaves, and winged fruit define its garden form. The supplied accounts give no species-level flowering months or hardiness rating. They also provide no evidence on pests, diseases, edible parts, or toxicity. Those gaps should not be read as proof of safety.