40 Rhodora [FEBRUARY 
differences are so slight as to be difficult to use except in actual 
comparison of large series of specimens. 
In organizing the North American material the writers have found 
the following key to the varieties of L. campestris, based largely on 
Buchenau’s treatment, of service. The measurements of the length 
of the perianth, which form the primary basis of division, have been 
made by the writers from the specimens they have examined, and, 
although the sizes of the flowers overlap, as would be expected in such 
a polymorphous species, the varieties recognized all seem to be definite 
geographic trends of the species. 
A. Plant stoloniferous: inflorescence loose: flowers of medium size (3 mm. 
long): Eurasian...............«<.o..oo.o.o... 1. L. campestris (typical). 
A. Plants caespitose. B. 
B. Perianth large (56.5 mm. long): heads globose to cylindric, 1-2 cm. 
long: inflorescence loaie: s.i disis riksin 2. var. macrantha. 
B. Perianth of medium size (2.5-4.5 mm. long). C. 
C. Perianth 3-4.5 mm. long, equaling or exceeding the capsule: heads 
cylindrical, rarely globose, the longer 10-30 mm. long: inflorescence 
loose or somewhat congested.................. 3. var. comosa. 
C. Perianth 3.5-4 mm. long, usually much exceeding the capsule; in- 
florescence with no obvious rays...... ........ 4. var. congesta. 
C. Perianth (2.8-)3-4 mm. long, usually exceeding the capsule: heads 
hemispherical to short-cylindrical, 3-9 mm. long, mostly on unequal 
rays; some short rays strongly divergent........ 5. var. echinata. 
C. Perianth 2.4-3.3 mm. long, slightly or not at all exceeding the cap- 
sule: heads globose or short-cylindrical, 4-11 mm. long, on mostly 
ascending rays. D. 
D. Perianth and capsule pale, ferruginous or moderately castaneous: 
inflorescence lax or rarely congested. 
Base of plant rarely producing bulblets: perianth 2.5-3.3 mm. 
| ss os oie sae PUN saa ae ee cae 6. var. multiflora 
Base of plant commonly producing bulblets: —perianth 
Dee Dg) mm. o A ue env ON 8. var. bulbosa. 
D. Perianth and capsule intensely castaneous or almost black: in- 
florescence usually congested.......o.oooooooo.o.o.. 7. var. frigida. 
B. Perianth small (1.8-2.3 mm. long). 
Inflorescence lax to somewhat dense: perianth and capsule pale to 
moderately castaneous. 
Base of plant copiously bulblet-bearing: perianth 2-2.3(-3) mm. 
O i es Pen a 8. var. bulbosa. 
Base of plant not bulblet-bearing: perianth 1.8-2.3 mm. long. 
9. var. pallescens. 
Inflorescence dense: perianth and capsule intensely castaneous or 
ETUDES A ee ek Des 10. var. alpina. 
