656 General Notes. : [June, : 
been several years in herbarium, and a few being modifications 
or changes of names for previously published species : 
1. Pantcum autumnale var. pubifiorum. 16. Poa kelloggii. 
2. Tripsacum lemmoni. 17. Poa flexuosa var. occidentalis. 
3- Aristida falmeri. 18. Poa alsodes var. occidentalis. 
4. Stipa stricta. 19. Poa stenantha var. brevifolia. 
5. Muhlenbergia wrightii. ` 20, Poa wardii, 
6. Sporobolus wolfit (Vilfa minima). 21. Poa elongata. 
7. Sporobolus interruptus. 22. Poa nevadensis. 
8. Agrastis foliosa. 23. Poa gracilis. 
9. Agrostis exarata var. littorale. 24. Glyceria lemmoni (Poa lem- 
10, Trisetum montanum. moni). 
11. Graphephorum wolfii ( Trisetumwolfii) 25. Festuca jonesii. 
12. Danthonia intermedia. Bouteloua burkii F. L. S. 
13. Bouteloua havardit. — 27. Deyeuxia tweedii F. L. S. 
14. Bouteloua pusilla. 28. Melica fruticosa F. L. S. 
15. Eragrostis neo-mexicana. 29. Muhlenbergia dumosa F. L. S. 
— George Vasey, Depart. of Agric., Washington, D. C., March 6. 
MEMORANDUM As TO THE Compass PLant.—My correspondent, 
Rev. Dr. Thomas Hill, LL.D.; formerly president of Ha 
now at Portland, Maine, thinks the stages of growth of the seed- 
ling of the compass plant (Si/phium laciniatum) should ha 
accurate and repeated observations, and a report of the direction 
of the young leaf at various dates. He made such oban 
favorable, and wishes that such experiments could be on 
again and minutely observed and reported. He planted in 
and south rows, but (not trusting that) he says, “ over t 
bed I stretched as soon as I had planted the seeds, ree 
cotton threads, as exactly in north and south direction n heee 
Then I had simply to measure by a paper protractor ee row : 
made by the young leaves with the threads. The mie ae | 
into rich, damp ground and be fairly exposed to lig a. 4 
sides. Measure at the end of each week, keeping oa when 
table.” He says, “they began to turn towards the met te length 
about four inches high, twisting the petioles in the whole **"> 
as they do so.’ at were 
In his letter he makes a diagram, grouping together pies n 
their directions at different dates; when very young Ea 
ight 
CLASSIFICATION OF THE Ureptnes.—Mr. C. B. pomni 
been studying the British plants of this group—the | $ sna papel 
are familiarly called—and has embodied the res 
