Arabis glabra

 Tower Mustard

Pods
Cypress Hills, West Block, just below plateau
09-July-2003

bullet

Glabra:  Answers to key questions in Budd's Flora and Flora of Alberta leading to this species.  
bullet

plants tall

bullet

plants glabrous and glaucous above

bullet

petals yellowish white (FOA)

bullet

mature fruiting pedicels erect to ascending, never horizontal or reflexed

bullet

siliques erect to ascending

bullet

siliques terete or semi-terete

bullet

siliques about 1 mm wide

 
bullet

Arabis: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 

 Note that Budd's Flora (BF) requires the flowers to be both yellow and greenish to yellowish white.  Flora of Alberta (FOA) requires the petals to be white or purplish, not yellow.  In fact, the petals are greenish or yellowish white, occasionally with purple tips.

Note that Flora of Alberta (FOA) requires the pods to be flat.  In fact, they are almost circular in cross section.
bullet

plants more or less pubescent (at least below)

bullet

hairs at least in part branched; NOT attached at the middle

bullet

leaves simple

bullet

stem leaves entire to dentate, not lobed

bullet

stem leaves broad with a sagittate base

bullet

flowers yellow (BF)

bullet

flowers greenish to yellowish white (BF)

bullet

petals white or purplish (FOA)

bullet

petals smaller than 15 to 25 mm long

bullet

fruit pod-like (silique or silicle)

bullet

fruit dehiscent by 2 valves

bullet

pods NOT compressed at right angles to the central partition

bullet

pods linear; NOT lanceolate to narrowly oblong

bullet

pods commonly flat, not torulose (FOA)

bullet

pods usually at least 4 times as long as wide

bullet

pods 1.5-12 cm long

bullet

pods scarcely beaked

bullet

septum NOT cross-striolate under high magnification

 
bullet

Cruciferae: Answers to key questions in Budd's Flora leading to this family.
bullet

herbs

bullet

plants terrestrial or semi-aquatic

bullet

plants not with colored milky juice

bullet

plants with more than one normal leaf

bullet

leaves without stipules, or having glands

bullet

some or all leaves alternate

bullet

calyx regular

bullet

4 sepals

bullet

corolla regular in shape

bullet

4 petals

bullet

stamens usually 6, 4 long and 2 short

bullet

ovary superior

bullet

1 or 2 carpels