CONTRIBUTIONS TO WESTERN BOTANY NO. li 61 



Greggia. Robinson, Gray and Watson in the Syn. flora p. 102 No. 

 30 put Greggia along with the angular-podded genera such as Erysimum, 

 Tropidocarpum, Sisymbrium, etc., in an anomalous group by itself, 

 where it is entirely out of place. In the early years Gray evidently con- 

 sidered the plant to belong wifli Synthlipas, Lyrocaxpa. and others with 

 which it more readily groups itself. The soft and broad and stellate- 

 pubescent leaves belong rather with the Dithyrea-Lyrocarpa group rather 

 than with the Sisymbrium-Erysimum group with their pick-shaped hairs. 

 The raised and rib-like septum in the middle of the greatly obcom- 

 pressed pods is that of Lyrocarpa and Dithyrea. 



Then the habitat is Tropical like that of the first two genera. The 

 petals are aberrant in being so broad, though suggesting Lyrocarpa 

 Xanti. In the Genera Syphanogamarum Torre and Harms follow the 

 Synoptical Flora and add nothing new to the systematic position, put- 

 ting Greggia next to Arabis and Erysimum, with which it is not at all 

 related. That the pods are related to Synthlipsis is evident, and closely 

 related too. An inspection of Gray's figure in VI Wright Tab. 1 p. 9 

 shows) that Gray had never seen a ripe pod of the genus when he founded 

 it. Whether Synthlipsis is generically distinct is another matttr. It would 

 appear to be 



would place it 

 rocarpa. Then fhe lobing of the stigmas is the .same as tn 

 the Synthlipsis group, that is>, lobes over the valves. 



Robinson states, p. 142, that Watson's G. linearitolia cannot be 

 maintained on the character of short styles and narrow lea\'e^ arvd 



gustifolia. My material of Greg- 



styles 3-6 mm. long. Those 



none 



Greggia continued. The mature pods of Greggia 'are conspiawus 

 obcompressed and flat, 2-3 mm. wide, with the septum conspicuous 



54 mm 



sign 



• }| 



the margins, at any point, the tip of the pod.s 

 being truncate to retuse, at both ends. Wooten & Standley p. 270, utrler 

 Neri-syrenia, a substitute for Greene's Parrasia attempt ^o Iceep 'up tte 

 specieg on the leaves, and ignore the stigmas, but Robinson's maten;il 

 seems to vitiate this character. They also speak of the pods bemg 

 "Quadrangular" a character that does not exist. Toward the tip .some 

 of the mature pods are bisulcate, but the angles of the valv s are rcmn-lf^ 

 always. It is curious that Robinson should give the t>'pe iwal't»e^ of 

 both species as "S. W. Texas" which is very tar from the truth, TA . aso 

 is the type locality for rmearifoFia, while both reputed speiie^ ^y^^<i 

 there, which is the extreme western side of Texas, and on 'tbe^norfh^**t- 

 crn comer. My material gathered from El Paso south : into ^^f-^^^ »* 



■copious, but does not show any transition betwee^ ^^ ' 



Physaria. There is too much inc^«nation a 

 Rydberg and Nelstm to jimap at conclusions in 

 Thiaspi. Physaria cannot be well understood without access to matjire 

 pods, and these are not always -dbtiinable, offimes the pods are sujjwrt 

 to arrested develoDmait f ^-^ -* r^nichirp in fhe :air. imt r»s as •*o 



a$ 



an 



• If 



