Braya thorild-wulffii subsp. thorild-wulffii
Braya
Greenland northern rockcress
northern-rockcress
erect to decumbent or ascending, unbranched or branched.
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.
(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).
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.
= 28.
Braya thorild-wulffii subsp. thorild-wulffii
Braya
Subspecies thorild-wulffii is known only from Axel Heiberg, Ellesmere, Melville, and Prince Patrick islands.
(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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