375 
I. PINACEAE 49 2. TAXACEAE 61 
ANGIOSPERMAE 61 
Monocotyledones 62 
1. TYPHACEAE 62 | 11. MAYACACEAE 367 | 20. CONVALLARIACEAE 427 
2. SPARGANIACEAE 63 | 12. XYRIDACEAE. 368 | 21. SMILACEAE 438 
3. NAIADACEAE 65 | 13. ERIOCAULACEAE 371) 22, HAEMODORACEAE 442 
4. SCHEUCHZERIACEAE 82 14. BROMELIACEAE 374) 23. AMARYLLIDACEAE 443 
5. ALISMACEAE 84 | 15. COMMELINACEAE 374) 24. DIOSCOREACEAE 446 
6. VALLISNERIACEAE 92 | 16. PONTEDERIACEAE 379! 25. IRIDACEAE 447 
7. GRAMINEAE 94 | 17. JUNCACEAE 381 | 26. MARANTACEAE 454 
8. CYPERACEAE 234 | 18. MELANTHACEAE 399 27. BURMANNIACEAE 455 
9. ARACEAE 360 | 19. LILIACEAE 410 | 28. ORCHIDACEAE 456 
To, LEMNACEAE 365 | 
Dicotyledones 482 
Choripetalae 482 
I, SAURURACEAE 482 | 8. ULMACEAE 523| 14. POLYGONACEAE 541 
2, JUGLANDACEAE 483 9. MoRACEAE 527 | 15. CHENOPODIACEAE 569 
3- MYRICACEAE 487 10. URTICACEAE 530, 16. AMARANTHACEAE 586 
4. LEITNERIACEAE 489 | 11. LORANTHACEAE  534| 17. PHYTOLACCACEAE 593 
5. SALICACEAE 490 | 12, SANTALACEAE §30| 18. NYCTAGINACEAE 594 
6. BETULACEAE 506 | 13. ARISTOLOCHIACEAE 537 19. AIZOACEAE 597 
7- FAGACEAE 513 
It is incidentally to be regarded as fortunate that this arrange- 
ment brings before our students in the first volume those families 
which are usually regarded as most difficult. By the aid of this 
volume, any field-student or collector can, during the coming 
months, and before the appearance of the remaining volumes, be- 
come fairly well acquainted with the representatives of these diffi- 
cult gr oups which are afforded by his locality. 
The work will doubtless be assailed by a certain class because 
of the narrowness with which the species-limits have been drawn. 
On this Subject it may be well to quote the authors: “The present 
tendency of expert opinion is to separate more freely into con- 
venient natural groups, as genera and families, according to simi- 
larity of Structure, habit, form or appearance.” (Introduction, 
P-v.) And it may be further remarked that the tendency to 
unite species is manifested rather by those who act as editors ; 
to separate them, by those who pursue special studies. In 
the performance of this portion of the work, Dr. Britton has been 
€xceptionally well situated. During the six years that this work 
has been under way, he has been surrounded by a large and ener- 
getic group of workers, trained and held together largely through 
the influence of the Torrey Botanical Club. These men and- 
