245 
our flora, T. pratensis L. and T. porrifolius L., and I accordingly 
paid no more attention to the matter. Later, I found a plant 
with intermediate characters, which was recorded as a hybrid 
between these species. This year I discovered that instead of 
two species, we had three; a second yellow-flowered form occur- 
ring in some abundance but quite locally on Tenth street. This 
caused me to collect a quantity of fresh material, which was 
described in detail. Having little European literature, I found 
it difficult to be sure of my species, and so sent particulars to 
Mr. Paul. C. Standley at the National Museum, requesting him 
to look in the European books. This he very kindly did, with 
the result of substantially confirming my guesses regarding the 
identity of the plants. Tragopogon as represented at Boulder 
may be described as follows: 
TRAGOPOGON L. 
Flowers purple; involucral bracts normally 8 to то. 
porrifolius L. 
Flowers very pale purplish; involucral bracts 9 to 13. 
porrifolius X dubius. 
Flowers chrome yellow; involucral bracts 8; leaves twisted. 
pratensis tortilis Pritz. 
Flowers lemon yellow: involucral bracts 13, rarely 8; leaves 
МТН eel Meter a E df dubius Scopoli. 
Tragopogon porrifolius L. 
Corolla purple; stigma purple; anthers black, ochreous marginal 
lines faint or absent; involucral bracts 8 or 10 in a head, 8 is the 
commoner number, one plant had heads with 8 and heads with 
10; bracts entirely green, extending about 10 mm. beyond ends 
of lateral corollas; tips of pappus purple, subapical hairs pale 
brown; fruiting heads broad at base, the stem below strongly, 
not abruptly, swollen; foliage normal, leaves straight. Very 
abundant. 
Tragopogon porrifolius X dubius hyb. nov. 
Corolla very pale purplish; stigma pale grey ; involucral bracts 
9 or 13, extending about 9 mm. beyond lateral corollas; pappus 
