Key to Alisma

View taxon page for Alisma

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

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

1. Inflorescence < to ± > leaves; style ± coiled; 

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).

 

blade 

Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped.

 

linear 

Elongate, with nearly parallel sides; narrower than elliptic or oblong.

to narrowly 

lanceolate 

Narrowly elongate, widest in the basal half, often tapered to an acute tip.

, base 

tapered 

Gradually (not abruptly) narrower or smaller at base or tip.

; 

pedicels 

Stalk of an individual flower in an inflorescence, or the corresponding structure in fruit.

generally 

recurved 

Gradually curved downward or backward.

to 

spreading 

Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal.

..... A. gramineum

1' Inflorescence generally >> leaves; style ± 

erect 

Upright; vertically oriented.

, tip recurved; leaf blade generally lanceolate to 

ovate 

Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf.

, base tapered or 

truncate 

Abruptly (not gradually) narrower or smaller at base or tip, as if cut straight across or nearly so.

to ± lobed; pedicels generally 

ascending 

Curving or angling upward from base, or about 30-60 degrees less than vertical or away from axis of attachment.

to erect

2. Petals pink; leaf blade generally lanceolate, base tapered; fruit lateral walls generally thin, translucent ..... A. lanceolatum

2' Petals white; leaf blade lanceolate to ovate, base truncate to ± lobed; fruit lateral walls thick, opaque ..... A. triviale

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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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