Field Trips

CNPS- Yerba Buena Natural History Walks:

We have cancelled all field trips while we shelter-in-place but hope to resume the field trips once the ban is lifted and the City declares it is safe to proceed. If you have any questions, please contact the leader of the trip you are interested in.


June 6, SATURDAY, 10am-Noon

The Daly City Dunes, San Bruno Mountain

Leader: Doug Allshouse

Imagine a 300-foot deep sand dune system that dates back about 125,000 years when San Bruno Mountain was almost an island, and it’s two miles from the ocean! Located at the mouth of lower Colma Canyon the dunes are a remnant of the Ancient Colma Dune Formation that once stretched from Colma to the Presidio, but now is fragmented by development in western San Francisco and Daly City. A piece of this site is relatively intact and supports a specific ecosystem not usually found at such a distance from the coast. Of great interest is the presence of San Francisco lessingia (Lessingia germanorum), an endangered dune plant now found only in the Presidio and the Dunes, its only known population in San Mateo County. Also present at the dunes is San Francisco spineflower (Chorizanthe cuspidata), dune suncup (Camissonia strigulosa), contorted suncup (Camissonia contorta), miniature suncup (Camissoniopsis micrantha), California suncup (Camissoniopsis bistorta), and blue beach lupine (Lupinus chamissonis). There should be a great bloom of farewell-to-spring (Clarkia rubicunda) on the backside and a population of California pipe vine nearby (Aristolochia californica), which means the sighting of beautiful Pipe Vine Swallowtails (Batus philenor) and their larvae is a distinct possibility. Wear sturdy shoes suitable for sand. Due to COVID-19 guidelines this field trip will be restricted to 10 persons. Contact Doug at, text or call 415-269-9967 to reserve a spot and get directions to the meeting place.



July 26, 2020 SUNDAY 10am – 12pm

The Natural Wonders of Glen Canyon
Leader: Paul Bouscal, CNPS Board member and California Naturalist

Join us on a summer hike to explore this canyon in the midst of residential neighborhoods. Glen Canyon is one of San Francisco’s significant natural resource areas containing a variety of vegetation including forbs, grasslands, shrubs, willows and other trees. At this time of year we hope to see summer wildflowers in bloom.  The park features rock formations, and it is the source of Islais Creek. We will walk and view parts of this 70-acre park to enjoy the flora, fauna and natural history.

Meet at Elk and Chenery Streets. This is approximately a 10-minute walk from the Glen Park BART station. In San Francisco layers of clothing are recommended.
Contact Paul at, or call 650-438-9109 if you have questions.



 August 6, THURSDAY 3:30 pm – 5:30 pm (timed to be prior to the speaker program)

San Francisco Botanical Garden in Summer

Leader: Paul Bouscal, CNPS Board member and California Naturalist

Take a summer hike in the San Francisco Botanical Garden’s California section to see a variety of plant species and the insects and wildlife they attract. Bring a bag supper and enjoy a communal meal in the garden among the native plants and evening wildlife. In summer it may be foggy; layers of clothing are recommended. Please note there is a non-resident fee to enter the SFBG.  Meet at the main entrance at 9th Ave. and Lincoln Way.

The CNPS speaker program is currently scheduled to start at 7:30pm at the County Fair Building (subject to shelter-in-place policies).

Contact Paul at, or call 650-438-9109 if you have questions.