FLORA OF THE SAN ANTONIO MOUNTAINS 121 



Though usually the rays are absent, plants are not uncommonly found 

 which are wholly or partially radiate. These radiate forms are easily sepa- 

 rated from the var. trifidum by their robustness and by their much broader 

 heads. (No. 1405.) 



Chaenactis santolinoides Greene. Frequent in dry ground under the pines in 

 the Lower Transition Zone. (No. 1489.) 



Hulsea heterochroma Gray. Seen twice, both stations being in the watershed of 

 Middle Fork Lytle Creek. Cucamonga Peak (Kellys Mine) alt. 8000 ft. and 

 in the Middle Fork at 6750 ft. alt. At the first station there was a very large 

 colony but at the other station only a few plants. (Nos. 1567, 1610.) 



Helenium Bigelovii Gray. Very common in springy ground in the Transition 

 Zone. (No. 1525.) 



Artemisia draucunculoides Pursh. Occasional in dry round in the Transition 

 Zone. (No. 1660.) 



Artemisia heterophyllus Nutt. Frequent in wet ground in the Lower Transition 

 Zone. Much commoner at lower levels. 



Artemisia tridentata Nutt. Very common in dry ground in the Lower Transition 

 Zone on the north side of the mountain, but not known to occur on the south 

 side. Noted at S000 ft. alt, 



Artemisia Ludoviciana Nutt. Common in Prairie Fork and on the ridges sur- 

 rounding it, also in the higher part of North Fork Lytle Creek. Dry ground 

 under the pines throughout the Transition Zone, alt. 6000-8500 ft. 



Very variable in pubescence and in habit. Some plants are permanently 

 tomentose above, although much less so than below, while other plants are 

 glabrate above. All our plants, however, agree in having the leaves pin- 

 nately cleft into narrow lobes. Dr. Rydberg has determined our No. 1651 as 

 A. diversifolia Rydb. (No. 1651.) 



Lcpidospartum squamatum Gray. Occasionally found in the lower portions of the 

 Transition Zone, usually dry sandy canon beds. (No. 1717.) 



Tetradymia canescens DC. Quite common throughout the Transition Zone on 

 the north side of the mountain. Two plants were noted on the south spur 

 of Telegraph Peak, the only noted station on the south side. Several shrubs 

 grow by the summit cairn on Pine Mountain and therefore at an altitude of 

 9660 ft. alt. (Nos. 1545, 1672.) 



Senecio ionophyllus Greene. (S. sparsilobatus Parish. S. bemardinus Greene.) 

 This very variable species is frequent under the pines on shaded north-facing 

 slopes, especially in the Upper Transition Zone. It was noted chiefly on the 

 side of the mountain facing the desert, only noted on the south slope of the 

 mountain in Cascade Fork of San Antonio Canon. 



The most common form of the plant is f. sparsilobatus (Parish) comb, now 

 This form, and several others which, although not altogether typical, are 

 best referred here, is predominating in all the colonies of the plant which we 

 have seen. The orbicular-leaved plant that is referable to typical S. iono- 

 phyllus and the densely tomentose, f. bemardinus (Greene) comb. nov. were 

 both found to be rather uncommon. (Nos. 1381, 1658, 2042, 2076, 2085.) 



Senecio triangularis Hook. Several large clumps in a marsh in a side canon of 

 Prairie Fork. Upper Transition Zone, alt. 7000 ft. (Nos. 1679, 2088.) 



