Lepidium densiflorum
 
Common Pepper-Grass

Inflorescence

Hudson Bay Regional Park
26-June-2018

Note the terminal cluster of flowers extends as the flowers mature.

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Densiflorum: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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annual or biennial; NOT [perennial]

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plant generally less than 5 dm tall; NOT [plant 5-12 dm tall]

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basal leaves at most pinnatifid; NOT [basal leaves bipinnatifid]

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upper leaves tapering at base; NOT [upper leaves sagittate or deeply cordate-clasping at the base]

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plants with elongated  terminal racemes; NOT [plants with short axillary racemes as well as terminal ones]

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petals none or rudimentary; NOT [petals linear, shorter than the sepals], NOT  [petals 2 mm long]

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stamens 2

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fruit 2.5-3.5 mm long; NOT [fruit 2.5-3.0 mm long]; NOT [silicle 5-7 mm long]

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fruit round-cordate or round-obovate; NOT [fruit oval or elliptic-ovate] (BF)

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fruit orbicular to obovate, widest above the middle; NOT [fruit elliptic to ovate, widest at or below the middle] (FOA)

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fruit rounded at the apex; NOT [fruit gradually narrowed toward acute apical teeth, one tooth on each side of apex]

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fruit notched at the apex

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fruit not winged

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fruit glabrous

 

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Lepidium: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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plants mostly terrestrial; NOT [plants aquatic, usually submerged]

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plants of lowland habitats; NOT [plants of alpine habitats]

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plants with leafy stems; NOT [plants with basal leaves only]

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petals white (may be rudimentary or absent); NOT [petals yellow]

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fruit shorter; NOT [fruit 8-18 mm long]

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fruit not strongly inflated

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fruit flattened at right angles to septum; NOT [fruit flattened parallel to septum, if at all]

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fruit 2-3 times longer than broad or shorter; NOT [fruit much longer than broad]

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fruit not triangular

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fruit wingless or only narrowly winged towards the apex; NOT [fruit broadly winged all round]

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pods notched at apex

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one seed in each compartment of pod; NOT [more than one seed in each compartment of pod]

 

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Cruciferae: Answers to key questions in Budd's Flora  leading to this family. 
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herbs; NOT [shrubs or trees]

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plants terrestrial or semiaquatic; NOT [plants aquatic, leaves submerged or floating]

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plants not with colored milky juice

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plants with more than one normal leaf

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some or all leaves alternate; NOT [leaves opposite, whorled, or basal]

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leaves without stipules, or having glands; NOT [leaves with stipules]

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flowers with two floral rings

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calyx regular; NOT [calyx irregular, some sepals smaller than others]

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sepals 4

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corolla regular in shape; NOT [corolla irregular in shape]

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each petal distinct from the others

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petals 4; NOT [petals 5]

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ovary superior; NOT [ovary inferior]

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carpels 1 or 2; NOT [carpels 3-5]