THE TREE. 15 
LENGTH OF TIME THAT LEAVES OF CONIFERS REMAIN ON 
TREES IN MINNESOTA. 
Botanical Name. Common Name. Year of Falling. 
PINUS SLVOBUS . oie vee eevee eee | White Pine sii... 2204 2d and 3d. 
PURWS Pl@RLUS 4 se suean sree de evnaes Western White Pine.| sth and 6th. 
PIBUS VESINOSA! a sicissnde Ho eies S00 ones Norway Pine........ 4th and sth. 
Pinus Qtvar1eala aa cicaveae Gh ene4 59 | Jack: Pine: oo: sseiunede 2d and ad. 
Pinus ponderosa scopulorum ...... | Bull Pineas vecesccnane 3d and 4th. 
PINUS SYLUESUITS. ie o's a sie ts BGS | Scotch Pine .......... | 3d. 
Pinus lartcto austriacd...... 0.4.5. Austrian Pine........ 4th and sth. 
Pinus montana pumtla.... 0.0.0... Dwarf Pine occ. eke sth, 6th and 7th. 
LOX AVCHD seve sain nioens 24 vse ne | Tamarack esses 00 vi 1st winter. 
EGVLE CUROPER Leased. gikus bos ....| European Larch.....) rst winter. 
Picea canadensts .................. | White Spruce ..... 4th and sth. 
PICEA MAKIANA 20. Levee ee eee Black Spruce......... 4th and sth. 
LACED. DUNGEONS: siccden Reokuain iayend Blue Spruce.......... 6th and 7th. 
Picea ENGEIMAUNE Cove e cc cceccceee. Engelmann Spruce ..| 5th and 6th. 
BECCA CEMCOVSA, 5.2 visa ens it eee pe esti Norway Spruce .. -| 5th. 
TSUfa CORAMENSIS sscc000 sc. 000r | Memlock: 2.2.0 22260: 2d and 3d. 
Pseudotsuga taxtfolia....... 6.000. | Douglas Spruce...... 5th. 
ALOIES GOS HEED Rese ievislra eine eehaetiae | Balsam Fir ove! Sth. 
AO eSHEOMCOTON a, dhud acreg otis eed | Wihlites BID 2. cin cae ae sth. 
THUZA. OCCTMENLAMS 3.025 03.5 eS Arborvite ...........| 4th and sth. 
SUNTPEVUS VIF EINTANA .... 0s | Red Cedar............ 5th and 6th. 
SUNTPCYUS COMMUNIS coe veee cere | Dwarf Juniper....... sth and 6th. 
Flowers are parts of the plant especially modified for the 
reproduction of the plant by seed. Both sexual organs may 
be located together in the same flower, as those of the Bass- 
wood, Mountain Ash and Cherry; or in separate flowers on 
the same plant, as those of the Birch, Oak and Black Walnut; 
or they may be separate on entirely different plants, as in the 
Willow, Poplar, Boxelder and Ash. 
