﻿REPORT 
  OF 
  THE 
  STATE 
  BOTANIST 
  1903 
  35 
  

  

  F 
  

  

  NEW 
  YORK 
  SPECIES 
  OF 
  CRATAEGUS 
  

  

  The 
  number 
  of 
  published 
  species 
  of 
  Crataegus 
  found 
  in 
  the 
  

   United 
  States 
  and 
  Canada 
  has 
  increased 
  surprisingly 
  within 
  the 
  

   last 
  five 
  veins. 
  In 
  the 
  edition 
  of 
  Cray's 
  Manual 
  issued! 
  in 
  1890, 
  

   10 
  species 
  and 
  three 
  varieties 
  are 
  recognized 
  as 
  belonging 
  to 
  the 
  

   territory 
  covered 
  by 
  its 
  flora. 
  In 
  the 
  Illustrated 
  Flora 
  of 
  Britton 
  

   and 
  Brown, 
  the 
  second 
  volume 
  of 
  which 
  contains 
  the 
  descrip- 
  

   tion 
  of 
  the 
  species 
  of 
  this 
  genus 
  ami 
  which 
  was 
  issued 
  in 
  1897, 
  

   15 
  species 
  and 
  three 
  varieties 
  are 
  recognized, 
  but 
  the 
  territory 
  

   covered 
  is 
  somewhat 
  larger 
  than 
  that 
  of 
  the 
  Manual. 
  Britton's 
  

   Manual 
  issued 
  in 
  1901 
  increases 
  the 
  number 
  to 
  31 
  species 
  and 
  

   retains 
  but 
  one 
  variety. 
  In 
  the 
  Silva 
  of 
  North 
  America, 
  volume 
  4, 
  

   published 
  in 
  1892, 
  11 
  species 
  are 
  described, 
  but 
  in 
  volume 
  13, 
  

   which 
  appeared 
  in 
  1902, 
  the 
  number 
  of 
  species 
  is 
  increased 
  to 
  84 
  

   and 
  the 
  statement 
  is 
  made 
  that 
  this 
  does 
  not 
  include 
  some 
  im- 
  

   perfectly 
  known 
  arboreous 
  species 
  nor 
  the 
  merely 
  shrubby 
  species. 
  

   In 
  the 
  Flora 
  of 
  the 
  Southern 
  States 
  by 
  J. 
  K. 
  Small, 
  issued 
  in 
  1903, 
  

   185 
  species 
  are 
  described. 
  Varieties 
  are 
  not 
  recognized. 
  In 
  an 
  

   article 
  devoted 
  to 
  the 
  species 
  of 
  Crataegus 
  found 
  in 
  Rochester 
  

   and 
  its 
  vicinity 
  and 
  published 
  in 
  the 
  Proceedings 
  of 
  the 
  Rochester 
  

   Academy 
  of 
  Science, 
  volume 
  4, 
  1903, 
  C. 
  S. 
  Sargent 
  has 
  described 
  

   28 
  neAv 
  species 
  and 
  recorded 
  the 
  occurrence 
  of 
  13 
  others 
  exclu- 
  

   sive 
  of 
  two 
  introduced 
  species 
  which 
  occasionally 
  escape 
  from 
  

   cultivation. 
  This 
  makes 
  41 
  species 
  for 
  the 
  limited 
  area 
  of 
  

   Rochester 
  and 
  its 
  vicinity, 
  a 
  number 
  greater 
  than 
  that 
  given 
  

   in 
  Britton's 
  Manual 
  for 
  the 
  entire 
  area 
  covered 
  by 
  it 
  two 
  years 
  

   ago. 
  From 
  these 
  data 
  the 
  inference 
  is 
  scarcely 
  avoidable 
  that 
  

   many 
  of 
  the 
  recently 
  described 
  species 
  must 
  resemble 
  each 
  other 
  

   closely 
  and 
  must 
  be 
  founded 
  on 
  slight 
  variations 
  of 
  specific 
  char- 
  

   acters. 
  If 
  this 
  inference 
  is 
  well 
  founded, 
  the 
  conclusion 
  is 
  evi- 
  

   dent 
  that 
  such 
  closely 
  allied 
  species 
  can 
  not 
  be 
  recognized 
  without 
  

   a 
  thorough 
  knowledge 
  of 
  their 
  distinguishing 
  characters 
  and 
  this 
  

   knowledge 
  can 
  scarcely 
  be 
  obtained 
  without 
  careful 
  study 
  and 
  

   close 
  observation. 
  To 
  properly 
  represent 
  such 
  species 
  in 
  the 
  

  

  