To meet complex needs in persons and families within specialist palliative care, care team members are expected to work together in performing a comprehensive assessment of patient needs. Team type (how integrated team members work) and team maturity (group development) have been identified as components in team effectiveness and productivity. The aim of the study reported in this paper was to identify team types in specialist palliative care in Sweden, and to explore associations between team type, team maturity and team effectiveness in home care teams. A national web-based survey of team types, based on Thylefors questionnaire, and a survey of healthcare professionals using the Group Development Questionnaire (GDQ-SE3) to assess team developmental phase, effectiveness and productivity were used in an exploratory cross-sectional design. The participants were: Specialist palliative care teams in Sweden registered in the Palliative Care Directory (n = 77), and members of 11 specialist palliative home care teams. Teams comprised physicians, registered nurses, social workers, physiotherapists and/or occupational therapists, full-or part-time. Our national web survey results showed that the 77 investigated teams had existed from 7 to 21 years, were foremost of medium size and functioned as inter- or transprofessional teams. Results from the 61 HCPs, representing 11 teams, indicated that more mature teams tended to work in an integrated manner, rather than in parallel. The effectiveness ratio varied from 52% to 86% in teams. Recommendations arising from our findings include the need for clarification of team goals and professional roles together with prioritizing the development of desirable psychosocial traits and team processes in clinical settings.