Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Antirrhinum

View taxon page for Antirrhinum

(For a list of species in Antirrhinum, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Stamens 2, staminodes 2

2. Corolla 25–35 mm, white or cream to pale yellow ..... A. confertiflorum

2' Corolla 15–20 mm, bright yellow ..... A. mohavea

1' Stamens 4, staminodes 0

3. Pedicels 3–10 cm, twining or with U-shaped hook

4. Corolla of opening flowers yellow and gold with maroon flecks on lower lipfruit fragile, opening by irregular bursting on sides ..... A. filipes

4' Corolla of opening flowers lavender to deep blue-purple, veins darker; fruit firm,  by 2 slits at tip ..... A. kelloggii

3' Pedicels 0.1–2.5 cm, not twining, not hooked

5. Proximal-most flowers not subtended by branchlets; flowers all opening; annual to  herb; plants self-supporting

6. Lower calyx  >= corolla tubeseed generally smooth, 1 side flattened, with raised, rough, irregular border ..... [A. orontium]

6' Lower calyx lobes < to << corolla tube; seed netted, ridged, or winged

7. Corolla 25–45 mm ..... [A. majus]

7' Corolla 7–18 mm

8. Flowers in terminal racemes; corolla 13–18 mm, pale pink to red; often perennial herb from 

9. Plant sticky-glandular-hairy ..... A. thompsonii

9' Plant glabrous ..... A. virga

8' Flowers 1 in  axils; corolla generally white, cream, or pale lavender, often with violet or purple veins or marks, 7–14 mm; annual

10. Corolla veins violet; swollen lower lip base with dense hairs to 1 mm; KR, NCoRI, w CaR, n ScV ..... A. cornutum

10' Corolla veins not contrasting in color; swollen lower lip base with sparse, sphere-tipped hairs; SN (especially SNF) ..... A. leptaleum

5' Proximal-most flowers and often others generally subtended by branchlets; flowers all opening or some cleistogamous; annual, rarely biennial; plants often not self-supporting, but climbing or sprawling

11. Calyx lobes ± equal

12. Only stem base and inflorescence hairy; upper fruit chamber  ..... A. coulterianum

12' Plant hairy throughout; both fruit chambers dehiscent ..... A. nuttallianum

13. Hairs very dense, very fine, of mixed lengths, tips ± not enlarged ..... subsp. nuttallianum

13' Hairs sparse to moderately dense, coarse, of ± = length, tips much-enlarged ..... subsp. subsessile

11' Calyx lobes unequal

14. Flowers cleistogamous and opening; corolla of opening flowers 5–7 mm, white, veins violet ..... A. kingii

14' Flowers all opening; corolla 8–20 mm, white to tan, cream tinged pink, or lavender

15. Corolla lower lip base not swollen, not closing throat, throat floor with 2 longitudinal folds ..... A. ovatum

15' Corolla lower lip base swollen, closing throat, throat floor without folds

16. Corolla white to tan, throat floor expanded at mouth, lower lip lobes , poorly developed ..... A. subcordatum

16' Corolla lavender, throat uniformly narrowed, lower lip lobes thrust forward,  or , conspicuous ..... A. vexillocalyculatum

17. Proximal stem glabrous or with nonglandular hairs to 3 mm; corolla 11–17 mm – s NCoR, ScV (Sutter Buttes), SnFrB, n SCoRI ..... subsp. vexillocalyculatum

17' Proximal stem glandular-hairy, with or without nonglandular hairs; corolla 8–14 mm

18. Branchlets subtending flowers with 1 leaf at proximal-most ; KR, NCoR, CaRF ..... subsp. breweri

18' Branchlets subtending flowers generally with 2 leaves at proximal-most node; n&c SN ..... subsp. intermedium


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