10 NORTH AMERICAN FLORA 
Pericarp gland-dotted; inflorescence spicate or paniculate. 
Seeds all or nearly all vertical. 
Pubescence of glandular hairs. 
Pubescence of inflated hairs or wanting, never glandular. 
Leaf-blades densely white-farinose beneath, at least when young. 
Leaf-blades very sparsely or not at all farinose. : 
Annuals, glabrous; stigmas very short. 
Perennials, sparsely farinose on the young parts; stigmas slender, 
elongate. 
I. Ursica 
Leaf-blades densely farinose beneath; inflorescence a naked terminal 
panicle; margins of the seeds acute. 
Leaf-blades glabrate. 
Inflorescence of axillary spikes; margins of the seeds obtuse. 
Inflorescence of axillary cymes; margins of the seeds acute. 
. II. PouysPpERMA 
A single species. 
. Tit. Hyeripa 
A single species. 
IV. LeprorpHyLLa 
Pericarp free from the seed. 
Leaf-blades linear, entire, l-nerved, or the lowest lance-linear, ob- 
scurely lobed at the base, and 3-nerved. 
Plants glabrate, bright-green; branches ascending or spreading; 
seed 1.5 mm. broad. 
Plants densely farinose; branches erect or strongly ascending; 
seed 1 mm. broad. : 
Leaf-blades narrowly lanceolate or oblong, 3-nerved. 
Plants tall, erect; leaf-blades narrowly lanceolate, the lower ones 
hastately lobed. : 
Plants low, usually diffusely branched; leaf-blades oblong, entire. 
Pericarp adherent to the seed. 
Leaf-blades linear; calyx closed in fruit; plants not ill-scented. 
Plants nearly glabrous; seed 1.5 mm. broad. 
Plants densely farinose; seed 0.8 mm. broad. 
Leaf-blades oblong or narrowly oblong; calyx open in fruit; plants 
ill-scented. 
Vv. CycLormia 
A single species. 
VI. Boscrana 
Pericarp adherent to the seed. . 
af-blades 0.4—0.8 cm. long; inflorescence densely leafy, the glomerules 
shorter than the leaves; seed 1 mm. broad. 
Leaf-blades 1.2-2 em. long; inflorescence nearly naked, open; seed 
0.50.6 mm. broad. 
Pericarp free from the seed. 
Plants copiously farinose. 
Plants bright-green, glabrate. 
Leaf-blades thick, the upper ones usually obtuse, the lower not 
sinuate-dentate; plants.stout, the inflorescence dense. 
Leaf-blades thin, the upper ones acute, the lower sinuate-dentate; 
plants very slender, the inflorescence lax. 
VII. FREMONTIANA 
Pericarp free from the seed. : 
Plants very stout, low, the inflorescence dense; leaf-blades thick, 
densely farinose, at least beneath, small. 
Plants slender, tall, the inflorescence slender, lax; leaf-blades thin, 
usually glabrate. 
Leaf-blades coarsely sinuate-dentate. . 
Leaf-blades entire except for the hastate, usually spreading lobes 
at the base. 
Pericarp adherent to the seed. 
Seed 1.3-1.5 mm. broad. 
Seed 0.7-1 mm. broad. : 
Leaf-blades broader than long, usually shorter than the petioles. 
Leaf-blades as long as broad or slightly longer, longer than the 
etioles. 
Leaf-blades mostly rounded at the apex, 1.5-2.5 cm. long; 
seed 0.7-0.8 mm. broad; branches strongly ascending. 
Leaf-blades usually acute, 0.7-1.6 cm. long; seed 1 mm. broad; 
branches ascending from a usually spreading base. 
[VoLuME 21 
XITT. AMBROSIOIDIA. 
XIV. CarinatTa. 
XV. Grauca. 
XVI. Rusra. 
XVII. CaLIFORNICA, 
1. C. mexicanum. 
urbicim, 
murale. 
eh 
an 
4, C. polyspermum., 
5. C. hybridum. 
6. C. subglabrum, 
7. C. leptophylium, 
8. C. pratericola. 
C. desiccatum. 
10. C. pallescens. 
11. C. tnamoenum. 
12. C. hians. 
13. C. cycloides. 
14. C. carnosulum, 
15. C. nevadense. 
16. C. albescens. 
17. C. atrovirens. 
18. C. Boscianum. 
19. C. incanum, 
C. Pringlei. 
21. C. Fremonti. 
C. 
Cc 
22. C. neomexicanum, 
23. C. flabellifolium. 
24, C. Palmeri. 
25. C. avizonicum. 
