  We present results from JHKs imaging of the densest region of the W49
molecular cloud. In a recent paper (Alves & Homeier 2003), we reported the
detection of (previously unknown) massive stellar clusters in the well-known
giant radio HII region W49A, and here we continue our analysis. We use the
extensive line-of-sight extinction to isolate a population of objects
associated with W49A. We constrain the slope of the stellar luminosity function
by constructing an extinction-limited luminosity function, and use this to
obtain a mass function. We find no evidence for a top-heavy MF, and the slope
of the derived mass function is -1.6 \pm 0.3. We identify candidate massive
stars from our color-magnitude diagram, and we use these to estimate the
current total stellar mass of 5-7x10^4 M_sun in the region of the W49 molecular
cloud covered by our survey. Candidate ionizing stars for several ultra-compact
HII regions are detected, with many having multipe candidate sources. On the
global molecular cloud scale in W49, massive star formation apparently did not
proceed in a single concentrated burst, but in small groups, or subclusters.
This may be an essential physical description for star formation in what will
later be termed a 'massive star cluster'.
