Field Trips

CNPS- Yerba Buena Natural History Walks:

We have a bountiful bevy of entertaining and informative walks coming in 2019!

All are welcome (some trips you need to register for but most you don't). We're out there...get out there with us!


December 1, 2019 SUNDAY 10:00am – 11:30am

Field Trip - Plants & Birds & Rocks & Things: A Walk through the Natural Histories of Glen Canyon

Leader: Paul Bouscal

Join us on a fall 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. 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.

CNPS member and California Naturalist Meet at Elk and Chenery Streets. This is approximately a 10 minute walk from the Glen Park BART station. Layers of clothing are recommended. Heavy rain cancels.

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


January 18, SATURDAY 10am-1pm

Field Trip - San Bruno Mountain: Saddle and Bog Trails

Leader: Doug Allshouse

This field trip is a first-of-the-year winter staple so let’s start with an easy walk around the saddle and bog with East Bay and San Francisco views. The saddle features grasslands, monocultures of gorse, a eucalyptus forest, the headwaters of Colma Creek, and a rare upland wetland. Several past restoration projects offer vivid examples of success and failure and are worth discussing.  The Saddle Trail is a wide fire road and is rich in plant species and its eastern grasslands share plant species common to the southeast portion of the mountain such as coast iris and purple needlegrass. We should see golden violet and silver lupine, the host plants for the endangered Callippe Silverspot and Mission Blue butterflies. The bog is a rare upland wetland with sedges, rushes, cow parsnip, willows, and creek dogwood.

The Bog Trail may be wet from winter rains so wear appropriate shoes. Bring layers because the Saddle Trail may be windy, but the Bog Trail is generally sheltered. There is a $6 fee (cash or credit/debit card) for park admission payable at the pay station. Meet in the main parking lot which is visible from the kiosk. Heavy rain postpones to January 25.

For questions, call or text Doug at 415-269-9967 or email

February 1, SATURDAY 10am to 11:30 am

Field Trip - Lobos Creek Valley, Presidio of San Francisco

Leader: Michael Chasse

Lobos Creek Valley has been called "a blazing landmark on the map of Bay Area restoration" (Orion Afield, 2002). The watershed contains some of the best examples of dune and riparian vegetation in San Francisco. Over 20 acres of dune habitat have been restored to support rare plants such as San Francisco lessingia (Lessingia germanorum), dune gilia (Gilia capitata ssp. chamissonis) and San Francisco spineflower (Chorizanthe cuspidata var. cuspidata). Current restoration efforts are focused on the arroyo willow and coast live oak riparian zone along Lobos Creek, a habitat that supports native species such as Pacific wax myrtle (Morella californica), red osier dogwood (Cornus sericea ssp. sericea), lady fern (Athyrium filix-femina), water parsley (Oenanthe sarmentosa), and scouring rush horsetail (Equisetum hyemale ssp. affine). In addition to exploring the restored dunes, this field trip will offer a behind-the-scenes look at recent work in the riparian zone, an area typically closed to the public.

Meet at the Lobos Creek Valley kiosk, located near 1750 Lincoln Blvd in the Presidio of San Francisco. This area is serviced by the Muni 29 bus. There is bike and auto parking in the lot adjacent to 1750 Lincoln Blvd. The hike will involve uneven terrain. Wear comfortable footwear and bring layers. Heavy rain cancels.

Contact Michael at if you have questions.