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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[Vol. 9, No. 3 



a distance up the lobes, terminating freely. No median veins are present. In the 

 top of the achene (fig. 107 C), the pairs of adjacent laterals unite. Xylem of 

 stamen traces often unites with that of laterals in the summit of the achene. In 

 addition to the five bundles in the achene connected directly with corolla bundles, 

 five other exterior bundles are present (fig. 107 C). These run from a plexus at 

 the achene top to the base of the achene. The style of Stomatochaeta crassifolia 

 contains two bundles (fig. 107 B). These enter the achene as a dorsiventral pair 

 of interior achene bundles (fig. 107 C). In addition, a lateral pair of interior 

 bundles is present in the achene (see also fig. 107 E, F). Near the base of the 

 achene, the dorsiventral interior bundles unite with nearby exterior bundles 

 (fig. 107 G), while the lateral pair forms a plexus with the ovule traces. At a 

 lower level, this plexus of vascular tissue is broken up into strands which join 

 exterior bundles (fig. 107 H). A cylinder of bundles enters the receptacle (fig. 

 107 I). In the configuration of vasculation at the achene base, Stomatochaeta 

 crassifolia shows considerable resemblance to species of Stenopadus, S. cucul- 

 latus for example. The ovule trace in the specimen examined was found to be 

 dichotomously branched (fig. 107 C). 



The other species of Stomatochaeta examined, S. condensata, S. cylindrica, 

 and S. cymbifolia, agreed with the pattern described for S. crassifolia except 

 that subsidiary bundles were not found in corollas of these species; they are 

 often not present in 5. crassifolia. Likewise, an unbranched ovule trace, seen 

 in S. crassifolia in addition to the dichotomous condition, was seen in material 

 of these species. 



Chimantaea. 



Although flowers of Chimantaea resemble those of Stomatochaeta closely in 

 gross morphology and indument, they differ significantly in details of venation. 

 Typical of the genus Chimantaea is C. rupicola (fig. 108). In the corollas of 

 this species (fig. 108A), only lateral veins are present in the lobes. These fuse 

 at the lobe apices; in addition, adjacent laterals fuse beneath the sinuses, a 

 feature not seen in Stomatochaeta. Thus five corolla bundles, together with 

 adjacent stamen traces (fig. 108D) enter the achene. Stamen traces join with 

 these fused laterals in the achene top. In addition to the five coroliine bundles, 

 five other exterior bundles are usually found in the achene wall (fig. 108C). In 

 the style (fig. 108B), the dorsiventral pair of bundles is present; a lateral pair of 

 smaller bundles runs from just below the point of bifurcation of the stigmatic 

 branches to the base of the style. The four (sometimes five) bundles of the 

 style connect with exterior bundles only a short distance beneath the top of the 

 achene*(fig. 108C, E). Thus, in contrast to the taxa above, only exterior bundles 

 are found in most of the length of the achene. The ovule trace is simple; at its 

 base, its vascular supply divides to join exterior bundles (fig. 108G). At the 

 base of the achene, as in Stenopadus and Stomatochaeta, a cylinder of vascular 

 bundles (fig. 108H) enters the receptacle. Specimens of other species of Chiman- 

 taea (C. lanocaulis, C. mirabilis) showed a venation pattern identical to that 

 described above for C. rupicola. 



Quelchia. 



A flower of Quelchia cardonae is seen in fig. 109. The corolla of this species 

 (fig. 109A), like that of Chimantaea rupicola, exhibits a simplicity in structure 

 which equals that found in the majority of Compositae. In the lobes, only lateral 

 veins are found; these fuse beneath the sinuses and at the lobe tips. Thus five 

 bundles and their associated stamen traces, which join with the corolla bundles in 



