Jepson Herbarium
The University and Jepson Herbaria
University of California, Berkeley
Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Sagittaria

View taxon page for Sagittaria

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

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

1. Pistillate flowers ± 
sessile 
image missingWithout a petiole, peduncle, pedicel, or other kind of stalk.
; scape bent at inflorescence ..... S. rigida

1' Pistillate flowers pedicelled; scape straight at inflorescence

2. Stolons, tubers 0; lowest inflorescence 
node 
image missingPosition on a stem from which one or more structures (especially leaves, buds, branches, or flowers) arise.
with 2 
bisexual 
image missingBoth male and female reproductive parts occurring and functional in the same plant or structure (e.g., flower, spikelet, inflorescence).
flowers ..... S. montevidensis subsp. calycina

2' Stolons, tubers present; lowest inflorescence node with 3 pistillate flowers

3. Emergent 
leaf 
image missingOrgan 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).
 blades 
linear 
image missingElongate, with nearly parallel sides; narrower than elliptic or oblong.
to 
lanceolate 
image missingNarrowly elongate, widest in the basal half, often tapered to an acute tip.
; 
pedicels 
image missingStalk of an individual flower in an inflorescence, or the corresponding structure in fruit.
 
recurved 
image missingGradually curved downward or backward.
in fruit, thickened ..... S. sanfordii

3' Emergent leaf blades generally 
sagittate 
image missingArrowhead-shaped, with two basal lobes oriented nearly parallel to the long axis.
; pedicels 
ascending 
image missingCurving or angling upward from base, or about 30-60 degrees less than vertical or away from axis of attachment.
in fruit, not thickened

4. Basal 
lobes 
image missing1. 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.
of emergent leaf blades generally > terminal; tubers spheric, tan ..... S. longiloba

4' Basal lobes of emergent leaf blades <= terminal; tubers 
oblong 
image missingLonger than wide, with nearly parallel sides; wider than linear.
, ± white or ± blue

5. Fruit beak terminal, 
erect 
image missingUpright; vertically oriented.
, 0.1–0.4 mm; emergent leaves with 
petioles 
image missingLeaf stalk, connecting leaf blade to stem; sometimes more or less indistinct.
recurved, 
basal 
image missingAt or near the base of a plant or plant part. Especially said of leaves clustered near the ground or of a placenta confined to the base of an ovary.
lobes of blades < terminal ..... S. cuneata

5' Fruit beak lateral, 
spreading 
image missingOriented more or less perpendicularly to the axis of attachment; often, more or less horizontal.
, 1–2 mm; emergent leaves with petioles ascending to erect, basal lobes of blades ± = terminal ..... S. latifolia

 

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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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