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Key to IvesiaView taxon page for Ivesia
(For a list of species in Ivesia, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Leaf ± flat, leaflets toothed or lobed generally < 3/4 to base, generally ± separate – plants rosettes  A radiating cluster of leaves generally at or near ground level. or hanging clumps 4. Petals pale yellow; hypanthium  Structure generally in the shape of a tube, cup, or bowl, derived from the fused lower portions of the perianth and stamens, from which these parts seem to arise, and to which the ovary wall is fused in an inferior ovary (to which the ovary wall is partially fused in a half-inferior ovary; from which the ovary is free in a superior ovary). bractlets ± = sepals ..... var. baileyi 3' Hypanthium bractlets generally 0; DMtns 1' Leaf ± cylindric  Elongate, with parallel sides and, at any point, round in transverse section. , leaflets generally lobed ± to base, overlapped 6. Stamens 10–20 (if 10, cauline leaves >= 3) 7. Leaflets < 8 per side; stems hanging to ± matted; caudex  Generally short, sometimes woody, more or less vertical stem of a perennial, at or beneath ground level. few- to many-branched; rock outcrops 8. Leaflet lobes  1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. < 4; petals white; SnJt ..... I. callida 7' Leaflets > 10 per side; stems decumbent  lying mostly flat on the ground but with tips curving up. to erect  Upright; vertically oriented. ; caudex 0–few-branched; meadows, sandy flats 9. Leaflets generally 15–20 per side; sheathing leaf  Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). bases glabrous; stamens 10–16, filament ± < 1 mm; style < 1.5 mm 9' Leaflets >= 20 per side; sheathing leaf bases generally ± strigose  With stiff, straight, sharp, appressed hairs. ; stamens 15–20; filament 1–4 mm; style ± > 2 mm 11. Inflorescence of separate flowers or generally < 5-flowered clusters; pedicels  Stalk of an individual flower in an inflorescence, or the corresponding structure in fruit. generally > 5 mm; leaflets generally 30–80 per side 12. Leaf mousetail-like, leaflets indistinct, obscured by dense, silvery hairs, lobes < 1.5 mm; stamens 15; pistil 1; granitic sand – SNH, TR, SnJt ..... I. santolinoides 12' Leaf not mousetail-like, leaflets overlapped but distinct, not obscured by hairs, lobes >= 2 mm; stamens 20; pistils >= 2; meadows 13. Herbage hairs ± 0 or appressed  Parallel or nearly parallel to and often in contact with surface of origin; used to describe the disposition of hairs, leaves, pedicels, etc. , < 1 mm; petals ± obovate; alkali meadows; n SNE ..... I. kingii var. kingii 13' Herbage hairs spreading  Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal. , < 4 mm; petals ± oblanceolate; generally on serpentine clays; c KR ..... I. pickeringii 11' Inflorescence of generally > 5-flowered clusters; pedicels generally < 3 mm (except lowest); leaflets 20–35 per side 14' Stem generally > 20 cm, decumbent to erect; leaves > 8 cm, cauline >= 3; filament thread-like, not flat; n SNH, MP 15' Petals yellow; hypanthium length <= width; hairs of stem base ascending  Curving or angling upward from base, or about 30-60 degrees less than vertical or away from axis of attachment. , < 2 mm ..... I. aperta 16. Petals 2–3 mm, oblanceolate; filament 1–1.5 mm; n SNH (except Dog Valley), s MP ..... var. aperta 16' Petals generally 4–7 mm, ± obovate; filament 2–4 mm; n SNH (Dog Valley, e Sierra Co.) ..... var. canina 6' Stamens 5 or 10; cauline leaves 1–3 17' Hypanthium bractlets ± 1/2 sepals 18. Inflorescence generally ± open between separate flowers or of ± loose clusters; plant ± matted from much-branched caudex; pedicels generally ± S-shaped in fruit; sheathing leaf bases strigose 19' Stamens 5; pistils generally < 5 20. Petals white to pale ± yellow, linear  Elongate, with nearly parallel sides; narrower than elliptic or oblong. , ± 1 mm; plant densely hairy, glands not obvious; 1400–1800 m; MP ..... I. paniculata 18' Inflorescence of 1–few generally head-like, 3–20-flowered clusters (becoming more open in Ivesia webberi); plant generally rosetted from 0–few-branched caudex; pedicels straight in fruit; sheathing leaf-bases hairy or not 21. Cauline leaves 2, ± opposite  1. Arranged in pairs along an axis - e.g., two leaves per node. 2. Occurring in the same rank, directly above or below, as 'stamens opposite petals'. 3. Located directly across from. ; leaflets 4–8 per side, lobes linear to lanceolate  Narrowly elongate, widest in the basal half, often tapered to an acute tip. ; 1500–1900 m – s-most MP, adjacent n SNH ..... I. webberi 21' Cauline leaves generally 1 or alternate  1. Arranged singly, often spirally, along an axis - e.g., one leaf per node. 2. Occurring in different ranks, appearing to be between, not directly above or below, as 'stamens alternate petals'. ; leaflets > 8 per side, lobes oblanceolate to ± round; > 1800 m 22. Leaf mousetail-like, leaflets indistinct, < 1 mm, hidden by dense, silvery hairs; petals 1–2 mm – c&s SNH ..... I. muirii 22' Leaf not mousetail-like, leaflets overlapped but distinct, generally > 1 mm, ± glabrous to ± hairy; petals >= 2 mm 23. Stamens 10; sheathing leaf-bases generally ± strigose; hypanthium length ± < l/2 width – c&s SNH ..... I. pygmaea (2) 23' Stamens 5; sheathing leaf-bases not strigose (± glabrous or glandular); hypanthium length > 1/2 width 24. Hypanthium length >= width; petals narrow-oblanceolate; pistils generally 2–4; fruit ± 2 mm, mottled brown ..... I. gordonii 24' Hypanthium length ± < width; petals ± obovate; pistils generally 5–15; fruit 1–1.5 mm, not mottled ..... I. lycopodioides 26' Leaflet lobes >= 1 mm, narrow-oblanceolate to obovate, often ± hairy; petals generally > 3 mm 27' Leaflet lobes 1–3 mm, moderately to densely hairy, bristle-tip generally 0.5–1 mm; vernally moist, rocky areas; c&s SNH, W&I ..... var. scandularis
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
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Lying flat on the ground.