Braya glabella subsp. prostrata
Braya
smooth northern-rockcress
northern-rockcress
decumbent to prostrate or weakly ascending, 0.3–1.5 dm.
erect to decumbent or ascending, unbranched or branched.
blade not fleshy, to 6 mm wide, margins usually entire.
basal and, sometimes, cauline;
petiolate or sessile;
basal rosulate, petiolate, blade margins entire, sinuate, dentate, or, rarely, pinnately lobed;
cauline usually absent, rarely few present, (sub)sessile, blade margins usually entire, rarely dentate or pinnately lobed.
not elongated in fruit (often compact).
(corymbose, sometimes bracteate basally or throughout), elongated or not in fruit.
sepals [sometimes persistent], oblong [ovate], lateral pair not saccate basally (sometimes slightly so in B. humilis and B. linearis);
petals white, pink, or purple [rarely pale yellow], obovate, oblanceolate, or spatulate, (slightly to much longer than sepals), claw distinct or not, (shorter than sepal, apex obtuse or rounded);
stamens tetradynamous;
filaments dilated or not basally;
anthers ovate or oblong, (apex usually obtuse, sometimes apiculate);
nectar glands (4), lateral, 1 on each side of lateral stamen.
erect, divaricate, or ascending, slender (much narrower than fruit).
oblong-elliptic to broadly oblong-lanceoloid, straight or curved, (0.7–)0.8–1.2 cm × 2.5–3.6 mm, 2.5–3.7 times as long as wide;
style stout, 0.8–1.8 mm.
siliques or silicles, sessile, linear, oblong, cylindrical, oval-elliptic, ovoid, lanceoloid, lanceoloid-subulate, or globose, smooth or torulose, terete or slightly latiseptate;
valves each often with prominent midvein, glabrous or pubescent;
replum rounded;
septum complete, (membranous, translucent);
ovules (5–)14–44 per ovary;
stigma capitate, entire or slightly 2-lobed.
plump, not winged, oblong or ovoid;
seed coat (minutely reticulate), not mucilaginous when wetted;
cotyledons incumbent.
= 7.
= 56.
Braya glabella subsp. prostrata
Braya
Subspecies prostrata is known only from Ellesmere Island.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 17 (7 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants not scapose; cauline leaves (1 or) 2-4; fruits linear; seeds usually uniseriate, rarely weakly biseriate | → 2 |
1. Plants scapose; cauline leaves 0 or 1 (or with leaflike bract subtending proximalmost pedicel); fruits ovoid, globose, oval-elliptic, oblong, oblong-elliptic, oblong-lanceoloid, or lanceoloid-subulate, not linear; seeds usually biseriate (uniseriate in B. fernaldii and, sometimes, B. longii) | → 3 |
2. Cauline leaves 3 or more; basal leaves (0.3-)0.5-2(-3.5) cm × 1-8(-10) mm; racemes elongated in fruit; fruits (0.9-)1.2-2.5(-3.2) cm | B. humilis |
2. Cauline leaves 1-4; basal leaves 0.5-3 cm × 0.5-2(-3) mm; racemes not elongated in fruit; fruits (0.5-)0.9-1.2(-1.4) cm. | B. linearis |
3. Fruits ovoid or globose | → 4 |
3. Fruits oval-elliptic, oblong, oblong-elliptic, oblong-lanceoloid, or lanceoloid-subulate | → 5 |
4. Petals 4.7-6.6 × 3-5.1 mm; styles 1.2-2(-2.5) mm; stems erect to ascending. | B. pilosa |
4. Petals 2-3.7 × 1-1.5 mm; styles obsolete to 0.7(-1) mm; stems usually decumbent to prostrate, sometimes ascending. | B. thorild-wulffii |
5. Fruits oval-elliptic, oblong-cylindrical, or lanceoloid; septum margins not expanded basally (not forming sacklike pouch around proximalmost seeds); seeds biseriate. | B. glabella |
5. Fruits lanceoloid-subulate; septum margins broadly expanded basally (forming sacklike pouch around proximalmost seeds); seeds somewhat to nearly uniseriate | → 6 |
6. Fruit valves pubescent; petals 2.4-3.8(-4) × (0.8-)1-1.3(-2) mm, (claws often not well- differentiated from blades). | B. fernaldii |
6. Fruit valves glabrous or sparsely pubescent; petals (3-)3.3-4.8(-5) × (1.2-)1.4-2.5(-3) mm, (claws usually well-differentiated from blades). | B. longii |
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