It gathers all
the alien weeds that come west in garden and grass seeds and
affords them harbor in its banks. There one finds the European
mallow (Malva rotundifolia) spreading out to the streets
with the summer overflow, and every spring a dandelion or two,
brought in with the blue grass seed, uncurls in the swardy soil.
Farther than either of these have come the lilies that the Chinese
coolies cultivate in adjacent mud holes for their foodful
bulbs. The seegoo establishes itself very readily in swampy
borders, and the white blossom spikes among the arrow-pointed
leaves are quite as acceptable to the eye as any native species.
In the neighborhood of towns founded by the Spanish
Californians, whether this plant is native to the locality or not,
one can always find aromatic clumps of yerba buena, the "good herb"
(Micromeria douglassii). The virtue of it as a febrifuge was taught
to the mission fathers by the neophytes, and wise old dames of my
acquaintance have worked astonishing cures with it and the succulent
yerba mansa. This last is native to wet meadows and distinguished
enough to have a family all to itself.
Where the irrigating ditches are shallow and a little
neglected, they choke quickly with watercress that multiplies about
the lowest Sierra springs. It is characteristic of the frequenters
of water borders near man haunts, that they are chiefly of the
sorts that are useful to man, as if they made their services an
excuse for the intrusion.
