伞花铁心木（學名：Metrosideros umbellata），又名南方鐵心木，是紐西蘭特有的十一種鐵心木的其中一種。能長至15米高及樹幹可達1米闊。[1]與其同屬物種一樣，能長出鮮艷的紅花；但與其近似種粗狀鐵心木不同，此種甚少以附生植物形式生長。
傘花鐵心木的花一般呈鮮紅色，也有白花及黃花，雄蕊約2厘米長。花期通常在12月至2月期間，取決於當地的環境條件。葉長由3到6厘米長不等，前緣尖銳。木質堅硬緻密。
樹皮是粗糙的和呈片狀，並為如Astelia物種和Freycinetia banksii（Kiekie）等附生植物提供一個理想的分層結構作其根部。傘花鐵心木是南島西海岸線花蜜的主要來源。 卡卡 TUI和鈴鳥就因其豐富的花蜜而時常造訪。
多在降雨量大而清爽的地區生長，是南島西岸重要的原生鐵心木花蜜的重要來源。[2] 此種是最廣泛分佈的新西蘭鐵心木品種。從北島_(紐西蘭)的南緯36度以南開始，在南島西部變得常見，但較少在東部出現。在斯圖爾特島（47ºS）上分普遍，並在奧克蘭群島在那裡達到其50ºS的南限。
Although Southern rātā is not regarded as threatened, it is rather uncommon in the North Island, and in certain areas it is threatened by possum browse. In the Tararua range, Southern rātā populations appear to have been replaced by a population consisting of hybrids between Northern and Southern rātā.
Project Crimson is a charitable trust that promotes conservation of rata as well as the related pohutukawa.
Southern rātā is a beautiful specimen tree, but growth can be slow unless it is grown in ideal conditions with moist soil. It is easily grown from fresh seed. While it is possible to grow the tree from softwood or semi-hardwood cuttings, these often prove reluctant to strike roots. It is ideal for coastal environments because it has a good resistance to wind and salt.[3]
