| Helianthella castanea |
Diablo Helianthella |
No |
| Helianthemum scoparium |
Common sun rose |
No |
| Helianthus annuus |
Sunflower |
No |
| Helianthus bolanderi |
Bolander's Sunflower |
No |
| Helianthus californicus |
California sunflower |
Yes |
| Heliotropium curassavicum |
Salt heliotrope |
Yes |
| Heracleum maximum |
Cow Parsnip |
No |
| Hesperocyparis abramsiana |
Santa Cruz cypress |
Yes |
| Hesperocyparis forbesii |
Tecate cypress |
Yes |
| Hesperocyparis guadalupensis Greenlee’s Blue Rocket |
'Greenlee's Blue Rocket' Guadalupe Island Cypress |
No |
| Hesperocyparis macnabiana |
Macnab cypress |
Yes |
| Hesperocyparis macrocarpa |
Monterey cypress |
Yes |
| Hesperocyparis macrocarpa ‘Wilma Goldcrest’ |
Monterey cypress 'Wilma Goldcrest' |
Yes |
| Hesperocyparis sargentii |
Sargent's cypress |
Yes |
| Hesperocyparis stephensonii |
Cuyamaca cypress |
Yes |
| Hesperoyucca peninsularis |
Peninsular Candle |
Yes |
| Hesperoyucca whipplei |
Chaparral yucca |
Yes |
| Heteromeles arbutifolia |
Toyon |
Yes |
| Heteromeles arbutifolia ‘Davis Gold’ |
'Davis Gold' Toyon |
Yes |
| Heterotheca sessiliflora ssp. bolanderi ‘San Bruno Mountain’ |
'San Bruno Mountain' Bolander's goldenaster |
Yes |
| Heuchera caespitosa ‘Bella Blanca’ |
'Bella Blanca' Urn-flowered Alumroot |
No |
| Heuchera Canyon Belle |
'Canyon Belle' Alumroot |
Yes |
| Heuchera Canyon Delight |
'Canyon Delight' Alumroot |
No |
| Heuchera Canyon Duet |
'Canyon Duet' Alumroot |
Yes |
| Heuchera Canyon Pink |
'Canyon Pink' Alumroot |
No |
| Heuchera cylindrica |
Roundleaf Alumroot |
Yes |
| Heuchera maxima |
Island Alumroot |
Yes |
| Heuchera micrantha |
Crevice Alumroot |
No |
| Heuchera micrantha ‘Martha Roderick’ |
'Martha Roderick' crevice alumroot |
Yes |
| Heuchera Old La Rochette |
'Old La Rochette' Alumroot |
Yes |
| Heuchera Rosada |
'Rosada' Alumroot |
Yes |
| Heuchera rubescens var. glandulosa |
Jack O' the Rocks |
Yes |
| Heuchera Santa Ana Cardinal |
'Santa Ana Cardinal' Alumroot |
Yes |
| Heuchera Wendy |
'Wendy' Alumroot |
No |
| Hibiscus lasiocarpos |
Rose mallow |
Yes |
| Hoita macrostachya |
California hemp |
Yes |
| Hoita strobilina |
Loma Prieta leather root |
No |
| Holodiscus discolor |
Ocean spray |
Yes |
| Hordeum brachyantherum ssp. californicum |
Meadow Barley |
No |
| Hosackia crassifolia var. crassifolia |
Broadleaf Hosackia |
No |
| Hosackia crassifolia var. otayensis |
Otay Mountain Hosackia |
No |
| Hosackia gracilis |
Harlequin Lotus |
No |
| Hymenoxys hoopesii |
Owl's Claws |
Yes |
| Ipomopsis aggregata |
Scarlet Gilia |
No |
| Iris ‘Dorothea’s Ruby’ |
Iris 'Pacific Coast Hybrid Dorothea's Ruby' |
Yes |
| Iris ‘PCH Canyon Sunshine’ |
Iris 'Pacific Coast Hybrid Canyon Sunshine' |
Yes |
| Iris ‘PCH Lavender” |
Iris 'Pacific Coast Hybrid Lavender' |
Yes |
| Iris ‘PCH Purple and White’ |
Iris 'Pacific Coast Hybrid Purple and White' |
No |
| Iris ‘PCH Yellow’ |
Iris 'Pacific Coast Hybrid Yellow' |
Yes |
| Iris bracteata |
Siskiyou Iris |
No |